Can You Be Autistic and Not Know Until Your Thirties or Forties?

Can You Be Autistic and Not Know Until Your Thirties or Forties?

By Leanne Mulheron

You have been at the dinner party for two hours and you are doing beautifully.

You asked Sophie about her renovation and remembered to ask a follow-up question. You laughed at the right moment, slightly after everyone else, because you were checking. You have been tracking the volume of your own voice, the angle of your face, how long you have been looking at the person speaking and whether it has tipped from attentive into unsettling. You moved seats once, away from the pendant light that was humming. You have an exit line ready and you have had it ready since you arrived.

Everyone thinks you are great at this.

Then you get into the car and you cannot speak. Not won’t. Cannot. Your partner asks if you had a nice time and the question arrives from somewhere underwater. You get home, you sit in the dark on the edge of the bed with your shoes still on, and you do not move for twenty minutes.

If you have done a version of this for thirty years, and if you have always assumed it was anxiety, or introversion, or being a bit much, or being not quite enough, there is another possibility that very few people will have raised with you.

Can you be autistic and not know until your forties?

Yes, and it is common. Autism is lifelong and presents from early development, but recognition is not. Many autistic women reach midlife without anyone suggesting it, because they learned early to mask: to study social rules and perform them deliberately. Masking works, often for decades, which is exactly why it delays recognition.

The diagnostic criteria most clinicians trained on were built largely from research on boys, and on a presentation that is externally obvious. A girl who is quiet, anxious, intensely interested in

one or two things, academically capable and socially careful does not look like that picture. She looks like a good student with a nervous stomach.

So she gets described instead. Sensitive. Shy. Old for her age. A worrier. Later: highly strung, difficult, too intense, hard to read. Each of those words is a near miss, and a near miss is worse than silence, because it gives everyone something to settle on.

What does masking actually look like in women?

Masking is the effort of presenting as non-autistic. It includes rehearsing conversations in advance, borrowing other people’s phrases and mannerisms, holding eye contact that is genuinely uncomfortable, suppressing the urge to move or stim, and monitoring your own face in real time. It is skilled, exhausting, largely invisible, and it is usually mistaken for being socially competent.

Here is the part that gets missed. Masking is not pretending. It is not dishonesty and it is not a lack of authenticity, it is emotional and psychological survival. Masking is a set of real skills, developed early, usually without anyone teaching them, because the alternative was being disliked and not understanding why.

What that costs is not visible from the outside, which is the whole point of it. The dinner party was a success. The twenty minutes on the edge of the bed with your shoes on is the invoice, and it arrives privately, hours later, to an address nobody else has.

A woman who has masked since primary school will often arrive at an assessment apologising. She will say she is probably wasting my time, because she has friends, she has a job, she managed a wedding. She will present her own competence as evidence against herself.

Competence is not evidence against anything. It is usually evidence of how hard she has been working.

Why does masking stop working in midlife?

Masking takes capacity, and several things in midlife reduce it at once. Perimenopause affects sleep, memory and emotional regulation. Caring for children and ageing parents removes recovery time. A child’s own diagnosis often prompts the first real question. When capacity drops, the mask becomes unsustainable.

This is the sequence I see most often, and it arrives in a particular order.

First, something gives. A job change, a divorce, a bereavement, a teenager in crisis, a body that has stopped sleeping. The thing that gave is not the cause, it is the removal of the surplus.

Second, the strategies stop returning what they used to. The woman who could do a full day of meetings and then a parent-teacher night now cannot do the meetings. She describes this, almost always, as getting worse at her life.

Third, and this is the one that undoes people, she takes her child to an assessment. She sits in the room while someone describes her eight-year-old’s sensory sensitivities, her need for routine, her distress at transitions, her very specific interests, and she thinks: that is me. That is a description of me.

A great many late recognitions in women begin in a paediatric waiting room.

I want to name something about this moment, because it is rarely acknowledged. It is not only relief. It is also grief, and the grief is legitimate. There is a real loss in understanding at forty-six that the exhaustion was not a character flaw, and that decades of it might have been met differently. You are allowed to be glad, sad and furious at the same time. Most women are.

Is it autism, or is it anxiety?

Often it is both, and the order matters. Lifelong anxiety that never fully responds to treatment, that is worst in social and sensory situations, and that sits alongside intense interests, a need for predictability and years of social effort, is worth looking at more carefully. Anxiety can be the consequence of unrecognised autism rather than the explanation for it.

By midlife, most autistic women I assess have a history of other labels. Generalised anxiety. Social anxiety. Depression, frequently. Burnout. Sometimes an eating disorder, sometimes chronic fatigue, sometimes a long stretch of being told it was stress.

None of those labels are necessarily wrong. Many of them are accurate descriptions of what unrecognised autism does to a person over thirty years of accommodation. The question is not which one is true. The question is whether anything underneath them was ever considered.

The reason this matters practically, rather than philosophically, is that treatment aimed at the wrong level does not hold. Like using a bandaid to heal a broken bone. Therapy that teaches a woman to challenge her anxious thoughts about social situations will have limited traction if the social situations are genuinely, physiologically costly for her and the thoughts are accurate. Strategies built on a correct understanding of how her brain works tend to stick. Strategies built on the assumption that she is a non-autistic person with faulty thinking tend not to.

What does a late autism assessment actually involve?

A comprehensive adult autism assessment looks at your developmental history, current functioning and the strategies you have used to cope. The appointment involves a structured and developmental interview and questionnaires. It explicitly accounts for masking, which

means asking about effort and recovery rather than only about observable behaviour. It can be completed by telehealth.

What it should not be is a half-hour conversation and a checklist. A checklist written for a visibly struggling child will reliably miss a forty-five-year-old woman who has spent her life learning to appear fine, because she will answer every question about observable behaviour “correctly” and the questions about cost will never be asked.

The useful questions are about the gap. Not “do you make eye contact”, but “what does making eye contact cost you, and what do you need afterwards”. Not “do you have friends”, but “how do you feel the day after seeing them”. Not “can you cope in an open-plan office”, but “what else have you given up in order to”.

People ask what the point of a diagnosis is at this stage of life, and it is a fair question. It will not undo the thirty years. What it does, in my experience, is three things. It changes the explanation, which changes the self-criticism. It makes accommodations legible, at work and at home, so that asking for them stops feeling like failing. And it gives you a basis for deciding deliberately which parts of the mask you want to keep and which you are finished with.

That last one is the part women tend to want most, and they almost never say so first.

If this sounds familiar

A late diagnosis explains a lifetime. It does not create one. Nothing about you changed in the reading of this page, and nothing was wrong with you before it either.

If the dinner party and the car and the twenty minutes on the edge of the bed are a recognisable account of your life, that is worth taking seriously, and it is worth taking to someone who knows what masking looks like from the inside of a clinical interview.

Affinity Psychology provides adult autism and ADHD assessment and therapy for women, with a neuro-affirming approach. Learn more about our assessments here.

Appointments in Mona Vale on Sydney’s Northern Beaches and telehealth across Australia. Medicare rebates may be available for therapy with a valid GP referral under a Mental Health Treatment Plan.

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