Why so many Autistic women and gender diverse people are identified late

The autism assessment tools were built around boys

Australia's statistics agency says autism assessment tools were built on how autism looks in males. The Australian Bureau of Statistics wrote that in its Autism in Australia, 2022 release, published in October 2024. It also pointed to a study of Australian health professionals. Many of them said their university training on autism in females was limited.

The national guideline said it first. The 2018 edition of Australia's autism assessment guideline told clinicians two things. The criteria and the tools were built around how autism usually shows in boys, and they may miss females who have no intellectual disability. The 2023 edition dropped that passage. The tools it describes are the same tools.

So when you were a child, the checklist was looking for a boy. If you did not look like that boy, the checklist had no box for you.

Autistic girls had to show more difficulty than boys to be identified

UK researchers held autistic traits constant, and boys were still more likely to be diagnosed. That finding came from a large group of children followed since the early 1990s.

A second UK study looked at children aged 10 to 12 with high autistic traits. Girls who met the cut-off for a diagnosis had more added difficulties than girls with equal scores who did not. For boys, there was no such difference. The authors offered two readings. Either diagnosis is biased against girls, or girls adapt in ways that hide the need. This article does not pick one, because the study did not.

The clearest measurement is a 2017 review of 54 studies and nearly 14 million children. It compared two ways of finding autistic children.

The gap between those two rows is the missing girls. The authors concluded that girls who meet the criteria often go without a clinical diagnosis. The ratio is still being studied, so read the numbers as a picture of the gap.

Masking hid your autism, and it kept you safe

Masking is what a person does to appear non-autistic. It can mean copying how other people talk, or holding in a movement your body wants to make. It can also mean rehearsing conversations, or forcing eye contact that hurts. Reframing Autism, an Autistic-led Australian organisation, calls it a coping strategy for everyday situations. Researchers Pearson and Rose call it a self-protective mechanism, a response to stigma rather than a free choice. It keeps you safe first, and the cost that arrives later is real.

Masking is also why the checklist could not see you. A UK study compared 306 autistic and 472 non-autistic adults. Autistic women reported more camouflaging, the research word for masking, than autistic men. Among non-autistic adults, there was no gender difference at all. Australia's national autism guideline now tells clinicians two things about masking. It appears more often in females, and it damages health and wellbeing. That guidance is consensus based: experts agreed on it, and no trial proved it.

Timing shows up too. A US study of 502 autistic adults compared identification in childhood and adulthood. People identified as adults reported more camouflaging. Those who masked more were identified later.

None of this means you should stop masking. In many rooms, masking is still the safe choice, and only you can judge that. It means the assessor never saw the effort, and the effort was the evidence. We have written separately about what long term masking can lead to.

Many Autistic women were given another diagnosis first

About one in four autistic adults said an earlier psychiatric diagnosis had been wrong. That is from a Dutch study of 1,211 autistic adults. Among autistic women it was 31.7%, and among autistic men 16.7%. Personality disorders were the most common of those earlier labels. Then came anxiety, mood conditions, chronic fatigue and ADHD.

The reason for the gap matters, because it is not the one most articles give. Among people with an earlier diagnosis, men and women called it wrong equally often. The difference was who had been sent to mental health services in the first place. About two in three autistic women had an earlier psychiatric diagnosis, and for autistic men it was one in three. Women were seen more, and seen for something else.

Two other studies fit the same pattern. A UK survey looked at women with high autistic traits and no diagnosis. They were more likely than diagnosed autistic women to have a borderline personality disorder label. And a Swedish study followed 3,189 people with anorexia. Among those who were also autistic, the anorexia was named first in 86% of cases. The gap averaged 6.1 years.

Each of those labels may have explained part of what you lived with. None of them was the whole answer, and the years spent on them were real.

Australia's own numbers show Autistic women are being identified now

Between 2018 and 2022, the number of Australian females identified as autistic almost doubled. The ABS counted 46,500 in 2018 and 90,900 in 2022. That is a rise of 95.5%, and the number of males rose 24.2% in the same period. In 2022, males were more than twice as likely as females to be autistic. In 2018 it had been more than three times. The ABS counts people who identify as autistic in a survey, so this measures identification changing, not autism changing.

The gap is widest in children and narrows with age. Among 5 to 14 year olds, 6.1% of males and 2.3% of females were autistic. Among 25 to 39 year olds, the figures were 0.8% and 0.5%. Read together, those rows show identification catching up in adulthood.

In an Australian study of 657 autistic adults, being female predicted a later diagnosis. That held after allowing for a person's current age and their autistic traits. Having no intellectual disability and a history of depression predicted a later diagnosis too. It is the closest thing Australia has to a measured answer, and it is a community sample rather than a count of everyone.

The same shape appears in another country. A 2026 study followed 171,134 people in one US health system. Females were diagnosed 3.4 years later than males on average: 15.7 years against 12.3. After 2020, new diagnoses among females rose about 19% a year. Among males they stayed flat or fell. The authors read this as better identification, not as a real rise in autism.

The Australian Government's National Autism Strategy 2025 to 2031 puts it plainly. Autistic women and gender diverse people often find out late in life. For many, it happens after their own child is identified. Our own study of 1,091 Australian families found the same crossover. Of parents raising neurodivergent children, 63% identified as neurodivergent themselves. The white paper has the detail. If that is how the question arrived for you, we have written about that moment.

Gender diverse Autistic people were missed for the same reasons

The National Autism Strategy names girls, women and gender diverse people together. It says their identification is likely to come later. It also lists them among fifteen groups the Government knows too little about. The national guideline notes that gender diversity is more common among autistic people than among others. It does not recommend screening every person for gender diversity during an autism assessment.

The research on timing is newer and smaller. In two of three US samples, gender diverse autistic people were diagnosed later than cisgender people, meaning people whose gender matches the sex recorded at birth. The third sample had not recorded gender identity at all. A 2026 Dutch study followed 2,722 autistic adults. Cisgender women were the oldest at diagnosis. Gender diverse people came next, then cisgender men. In that same study, gender diverse participants carried the most other mental health diagnoses alongside autism. They also had the highest rate of earlier diagnoses they believed were wrong.

The order changes from study to study. The point is not who was missed most. Everyone who did not look like the boy on the checklist was missed the same way. Australian autistic girls and gender diverse young people were asked what research they wanted. Experiences of gender diversity made their list of six priorities. The autistic adults in the same study wrote a different list. That shows how little of this has been asked.

What being identified as Autistic later changes, and what it does not

Eleven autistic women identified after 40 told UK researchers about living with a hidden condition. Its two parts had names. The researchers called them "pretending to be normal and fitting in" and "mental health and mislabelling". Several women described identification as a shift "from being self-critical to self-compassionate". The same women said the change was painful to adjust to so late in life.

In Australia, 31 autistic women and gender diverse adults talked about formal identification. Their theme for it was "shedding all the layers and being myself". A 2026 UK study of thirteen adults identified late as Autistic, ADHD or both found a flip side. It called this "the burden of a label". Other people's reactions were often the hardest part.

This article does not decide what you are. Only you can do that, with an assessor if you choose one. What it explains is why the question arrived so late. Nothing about you was hidden from people who knew where to look, and almost nobody did. An Australian allied health professional we interviewed was identified in her early forties. She described exactly who gets missed, and why.

What you can do now, whether or not you seek an autism assessment

You do not need a diagnosis to deserve support, so begin where you are.

If you want to understand yourself first, reading and community cost nothing. Talking with other late identified adults costs nothing either. Understanding Zoe is an Australian app built for that gap. It does not assess or diagnose anyone. It helps you make sense of your own patterns and keep track of what works. It is free for the first seven days. You do not need a diagnosis to use it.

If you are weighing up an autism assessment, read our guide to late identification in Australia. It sets out what the process involves and what comes after.

If your question is about ADHD rather than autism, the pathway and cost are different. We have a separate piece on whether an ADHD assessment is worth it at 40.

If you are grieving the child who went without help, many identified late feel the same. It is not a sign you are wrong about yourself.

Frequently asked questions

Why are Autistic women identified later than Autistic men?

Three reasons, and all three are in Australia's own documents. The assessment tools were built around how autism looks in boys. Girls who presented differently were not picked up. Girls needed more visible difficulty than boys before anyone assessed them. And autistic women mask more than autistic men on average. Masking hides the traits an assessor looks for. The ABS and the national autism guideline both say so.

What is autistic masking, in plain words?

Masking is what an autistic person does to appear non-autistic. Copying how others speak, holding in a stim, rehearsing what to say, forcing eye contact. Autistic-led organisations describe it as a coping strategy. It protects you from stigma and gets you through the day. It works, it costs energy, and it can hide real distress.

How often are Autistic women given a different diagnosis first?

A Dutch study asked 1,211 autistic adults about earlier diagnoses. Among women, 31.7% said one had been wrong. Among men it was 16.7%. Personality disorders, anxiety and mood conditions were the most common. The gap came from women being sent to mental health services more often. It did not come from clinicians misjudging women more once they were there.

Can you be Autistic if nobody noticed when you were a child?

Yes. Autism is lifelong, so being identified late means the identification was late, not the autism. Between 2018 and 2022, the number of Australian females identified as autistic almost doubled. That rise is people being identified, not autism becoming more common. Assessed recently? Our guide for adults just identified as Autistic is the next step.

Are gender diverse Autistic people identified later than Autistic women?

The studies disagree on the order, and the order is not the point. In two US samples, gender diverse autistic people were diagnosed later than cisgender people. In a 2026 Dutch study, cisgender women were the oldest at diagnosis. Gender diverse people came next. Both groups were missed for the same reason. They did not look like the boy the checklist was built around. We write about this under AuDHD and late identification.

Does being identified as Autistic late help?

For many people, yes, and not simply. Women identified after 40 described moving from self-criticism to self-compassion. Australian adults described "shedding all the layers and being myself". Adults identified late as Autistic or ADHD also described "the burden of a label", and painful reactions from people around them. Both can be true at once.

Sources

1. Australian Government, Department of Health, Disability and Ageing. National Autism Strategy 2025-2031. 2025. Printed pages 10, 13 and 32.
2. Australian Bureau of Statistics. Autism in Australia, 2022. Released 11 October 2024, from the 2022 Survey of Disability, Ageing and Carers.
3. Autism CRC. National Guideline for the Assessment and Diagnosis of Autism in Australia, second edition, 2023. NHMRC approved 8 December 2023. Recommendation 61, Good Practice Point 61.1, printed page 112.
4. Whitehouse A, Evans K, Eapen V, Wray J. A National Guideline for the Assessment and Diagnosis of Autism Spectrum Disorders in Australia. Autism CRC, October 2018, archived copy. Section 12.3, printed page 56. The 2023 edition no longer carries this passage.
5. Russell G, Steer C, Golding J. Social and demographic factors that influence the diagnosis of autistic spectrum disorders. Social Psychiatry and Psychiatric Epidemiology, 2011. PMID 20938640.
6. Dworzynski K et al. How different are girls and boys above and below the diagnostic threshold for autism spectrum disorders? Journal of the American Academy of Child and Adolescent Psychiatry, 2012. PMID 22840550.
7. Loomes R, Hull L, Mandy WPL. What Is the Male-to-Female Ratio in Autism Spectrum Disorder? A Systematic Review and Meta-Analysis. Journal of the American Academy of Child and Adolescent Psychiatry, 2017. PMID 28545751.
8. Hull L et al. Gender differences in self-reported camouflaging in autistic and non-autistic adults. Autism, 2020. PMID 31319684.
9. McQuaid GA, Lee NR, Wallace GL. Camouflaging in autism spectrum disorder: Examining the roles of sex, gender identity, and diagnostic timing. Autism, 2022. PMID 34420418.
10. Pearson A, Rose K. A Conceptual Analysis of Autistic Masking: Understanding the Narrative of Stigma and the Illusion of Choice. Autism in Adulthood, 2021. PMID 36601266.
11. Reframing Autism. On Autistic masking. 2025.
12. National Autistic Society. Masking.
13. Kentrou V et al. Perceived misdiagnosis of psychiatric conditions in autistic adults. eClinicalMedicine, 2024. PMID 38596613.
14. Belcher HL et al. Shining a Light on a Hidden Population: Social Functioning and Mental Health in Women Reporting Autistic Traits But Lacking Diagnosis. Journal of Autism and Developmental Disorders, 2023. PMID 35593995.
15. Zhang R et al. Association of autism diagnosis and polygenic scores with eating disorder severity. European Eating Disorders Review, 2022. PMID 35855524.
16. Zidane Burgess et al. Diagnostic challenges in predominantly late-diagnosed gender-diverse autistic individuals: Age, delays, and perceived misdiagnoses. Autism, 2026. PMID 41841559.
17. McQuaid GA et al. Gender, assigned sex at birth, and gender diversity: Windows into diagnostic timing disparities in autism. Autism, 2024. PMID 38587289.
18. Huang Y et al. Factors associated with age at autism diagnosis in a community sample of Australian adults. Autism Research, 2021. PMID 34529351.
19. Messias E et al. Autism Spectrum Disorder Incidence by Age and Sex in a US Health Care System, 2016 to 2024. JAMA Network Open, 2026. PMID 42485038.
20. Grove R et al. 'Nothing About Us, Without Us': Research Priorities for Autistic Girls, Women and Gender Diverse People in Australia. Journal of Autism and Developmental Disorders, 2025. PMID 38709358.
21. Grove R et al. 'Living in a world that's not about us': The impact of everyday life on the health and wellbeing of autistic women and gender diverse people. Women's Health, 2023. PMID 37727115.
22. Leedham A, Thompson AR, Smith R, Freeth M. 'I was exhausted trying to figure it out': The experiences of females receiving an autism diagnosis in middle to late adulthood. Autism, 2020. PMID 31144507.
23. French B, Cassidy S. 'Going Through Life on Hard Mode': The Experience of Late Diagnosis of Autism and/or ADHD. Autism in Adulthood, 2026. PMID 42369101. The first author declares fees from Takeda and Medice.