Do You Grow Out of Autism?

The understanding of autism has come full circle.

Back in the 1940s, autism was recognized as a lifelong disability. Then came decades during which many believed that autism was something you could "grow out of." Today, we’ve returned to the more nuanced and accurate view: Autism is lifelong, with a broad spectrum of experiences that continue well beyond childhood.

This evolving perspective has significant implications for how we support autistic people; not just as children, but across all stages of life. That includes autistic adults who need support navigating work, relationships, and independent living, as well as those with higher support needs who may require lifelong assistance with housing, daily care, and communication. The shift away from seeing autism as only a childhood phase calls for systems that plan for these realities across the lifespan; including old age, which affects everyone on the spectrum.

Kanner’s Early View: Autism as Lifelong

When child psychiatrist Leo Kanner first wrote about autism in 1943, he described it as something present from early infancy that stayed with a person for life. He noted traits like social withdrawal, repetitive behaviors, and a strong preference for sameness. To him, these weren’t phases; they were deeply rooted characteristics.

Kanner believed autism was innate and lifelong. And while he acknowledged that some children might improve with support, he saw autism itself as something that didn’t disappear. His work laid the groundwork for how autism was initially studied and understood.

The Mid-Century Shift: Autism as a Childhood Phase

By the 1950s and 1960s, the focus began to shift. Autism came to be seen as something that mainly affected children. Here’s why.

1. Lack of Long-Term Studies. At the time, researchers didn’t have data on how autistic children fared into adulthood. Without long-term follow-up, the focus stayed on early interventions, mostly aimed at helping children “catch up” in communication or social skills. This gave rise to the belief that autism was mostly a childhood presentation.

2. The Lens of Child Development. Autism was studied through the lens of developmental psychology, which focuses on the milestones of childhood. This reinforced the assumption that autism was something kids might “outgrow,” especially if they seemed to make progress.

3. Institutionalization and Visibility. For much of the 20th century, many autistics—especially those with higher support needs—were placed in institutions. This meant that they were often hidden from public life. And when people are out of sight, they’re often out of mind. Without seeing autistic adults in everyday life, society began to forget they existed.

4. Diagnostic Language. When the third edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III) came out in 1980, it described autism as something that appeared in early childhood. The DSM is the guide used by clinicians to diagnose mental health and developmental conditions, and each new edition has shaped how autism is understood and identified. However, the DSM-III said little about autism in adulthood. So, once again, the focus stayed firmly on kids.

The Shift Back: Autism as a Lifelong Spectrum

By the late 20th century, the tide began to turn again. Several key developments brought us back to a fuller picture of autism as a lifelong experience:

1. Long-Term Research. Starting in the 1970s and 1980s, researchers began tracking autistic individuals over time. What they found was clear: Many core traits; like differences in social communication or sensory processing, didn’t just go away with age. Some people found ways to adapt, but the autism itself remained.

2. Expanding the Definition. The 1994 release of the DSM-IV broadened the definition of autism to include conditions like Asperger syndrome and PDD-NOS (Pervasive Developmental Disorder-Not Otherwise Specified). This reflected a growing recognition that autism looks different in different people and spans a wide range of abilities and experiences. The idea of a “spectrum” started to take hold.

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3. Autistic Self-Advocacy. When the autistic children of earlier decades grew up, they began to speak for themselves. As more autistic adults shared their lived experiences, the narrative began to shift. They spoke openly about navigating adulthood as autistics and highlighted the ongoing need for support, recognition, and rights. Inspired by the broader disability-rights movement, their advocacy made it clear: Autism doesn’t end at 18. They called for inclusive systems and accommodations that reflect the realities of autistic disability across the lifespan.

4. A Unified Spectrum. In 2013, the DSM-5 officially introduced the term Autism Spectrum Disorder (ASD), consolidating the different labels under one umbrella. While the medical community still used the term “disorder,” this shift acknowledged that autism spans a wide range and continues across the lifespan.

And yet, for many autistic individuals and their families, the reality has not caught up.

Even as our understanding of autism has expanded, services often drop off sharply after childhood; a phenomenon widely known as the services cliff. Support systems that were available in during the school age years frequently vanish once a person turns 18 or 21, leaving many autistic adults and their families struggling to navigate healthcare, housing, daily living, employment and more without adequate resources.

The services cliff isn’t just a gap. It’s a free fall for too many autistics and their families.

Source: Hari Srinivasan

Why This Matters

The services cliff highlights a major disconnect between how we understand autism and how we support autistic people in practice. Recognizing autism as a lifelong spectrum changes everything, from how we think about education to how we plan healthcare, jobs, housing, lifelong caregiving needs, and aging support.

This shift in understanding means we must build systems that support autistic people across their entire lives, not just in childhood. This includes services tailored to adulthood: access to meaningful employment, comprehensive healthcare, safe and supportive housing, comprehensive caregiving for those needing them, and opportunities for community connection and inclusion. It also highlights the urgent need for more research on what adulthood and aging look like for autistics, including those with higher support needs. Only by acknowledging the full arc of autistic life can we create policies and programs that truly meet people where they are.

You don’t grow out of autism; you grow into a world that isn’t ready.

Importantly, this perspective validates what many autistic people have been saying all along: Autism isn’t something you grow out of. And that deserves recognition, respect, and support throughout life.