In brief. Autism is a lifelong difference in how a person communicates, relates, senses and processes the world. Around one in 70 Australians is autistic, and most adults were never diagnosed as children because the picture clinicians were trained to look for was a boy with obvious traits. Adults who recognise themselves late are usually right to look further.
What autism looks like in adults
The DSM-5-TR describes autism in two domains: differences in social communication and interaction, and restricted or repetitive patterns of behaviour, interests or sensory responses, present from early development and affecting daily life. In adults, particularly those who have spent decades adapting, that translates into patterns like these:
Social communication
- Finding small talk effortful or pointless while being fluent on topics you care about.
- Missing implied meaning, sarcasm or hints; preferring people to say what they mean.
- Rehearsing conversations before and replaying them after.
- Exhaustion after social events out of proportion to their length.
- Friendships that are few, deep and often built around shared interests.
- Eye contact that feels forced, or that you have learned to fake by looking at foreheads.
Patterns, interests and sensory life
- Deep, sustained interests that others call obsessive and you call restful.
- Distress when routines or plans change without warning.
- Strong reactions to noise, light, textures, smells or touch; or unusually little reaction.
- Repetitive movements or sounds that regulate you (stimming).
- Needing rules to be applied consistently and being unsettled by exceptions.
Two questions to start
Take the full self-testWHO adult ADHD screener. Scored on your device. A screen is not a diagnosis.
Why it was missed
Autism was defined on boys with visible traits and intellectual disability. Adults who are verbal, employed and partnered were assumed not to be autistic. Many, especially women and people who learned to mask, were diagnosed instead with anxiety, depression, borderline personality disorder or eating disorders, and treated for years without the underlying explanation. The Autism CRC's national guideline for assessment, first published in 2018 and updated since, explicitly recognises adult and late presentations.
Autism, ADHD and AuDHD
ADHD and autism co-occur far more often than chance, and the combination has its own texture: a need for routine alongside an inability to keep one, intense focus alongside distractibility, social exhaustion alongside a craving for stimulation. See AuDHD. Assessment should consider both.
Adult assessment in Australia
Adult autism assessment is usually a clinical interview with a psychologist or psychiatrist experienced in adult presentations, covering developmental history, current traits across settings, sensory profile, masking and co-occurring conditions, often with standardised measures and input from someone who knew you as a child where possible. There is no Medicare item that covers the whole adult assessment, so most people pay privately; see what autism assessment costs. A diagnosis is not required to access affirming therapy, and many adults choose self-identification with or without formal assessment.
What Inner Help does
Our finder lists practitioners who state they work with autistic adults, and the free autism self-test (AQ-10 or RAADS-R, scored on your device) is a two-minute starting point. Nothing on this page is a diagnosis.
Get matched to a therapist.
A short questionnaire, then a practitioner who understands neurodivergence. Per session with your rebate lodged, or a weekly plan.
Frequently asked questions
Can you be autistic and not know until adulthood?
Yes, and it is common. Coping strategies, intelligence and a supportive environment can hide autism for decades. Recognition often comes when a child is diagnosed, when demands rise, or after burnout.
Is Asperger's still a diagnosis?
No. Asperger's was folded into autism spectrum disorder in DSM-5 in 2013. People diagnosed under the old term are autistic under the current one; some still use the older word for themselves.
Do I need a formal diagnosis?
Not to access therapy or to understand yourself. A formal diagnosis can matter for workplace adjustments, NDIS eligibility and some supports. Many adults weigh the cost against those benefits.
Is there a cure or treatment for autism?
Autism is not an illness to cure. Support focuses on the things that cause distress: anxiety, burnout, sensory overload, communication mismatches, and the effects of a lifetime of masking.
Sources and review
Last updated 2026-09-14.