Meet the Longest Living Autistic Person: Donald Triplett’s Inspiring Story

September 4, 2025

If you’re wondering who holds the record for the longest‑living person diagnosed with autism, the answer is Donald Gray Triplett, widely known as “Case 1.” 


He was the very first person officially diagnosed with autism by Leo Kanner and lived to be 89 years old, passing away in 2023. He remains one of the oldest documented individuals with an autism diagnosis


That’s the short and sweet answer! Now, let’s explore a bit more.


Donald Triplett Pioneer in autism history Center node: Donald Triplett Why he matters First person diagnosed Helped illuminate aging with autism Click to read: Why he matters Remarkable longevity Lived to age 89 Exceeding common statistics Click to read: His longevity Research context Average life expectancy −16 to −18 years Click to read: Research context
Why he matters

As the first person ever diagnosed with autism, Donald’s life story has helped researchers understand long-term aging with autism.

Remarkable longevity

Living until age 89, he far surpassed many statistical life expectancy estimates for autistic individuals.

Research context

On average, studies show autistic people have a reduced life expectancy—often by 16 to 18 years compared to the general population. Yet Donald’s life reminds us that with support and resilience, many autistic people can—and do—live long, fulfilled lives.

Understanding neurodiversity means recognizing both the challenges and the potential for a rich, long life. That’s why Blue Jay ABA offers a range of compassionate, effective therapy options to support clients and families in North Carolina for the long run:


  • Home-based ABA – In-home therapy tailored to your child’s daily routines.
  • School-based ABA therapy – Support inside the school setting, helping bridge learning and developmental progress.
  • Telehealth ABA – Flexible, virtual ABA therapy for busy schedules or more remote support.


Whether at home, in school, or online, Blue Jay ABA’s team helps children grow life skills, communication, and independence in a friendly, caring environment.


Ready to support your child now—and through every stage of life? Reach out to Blue Jay ABA today to get started!


FAQs

  • Who is the longest living autistic person?

    The longest living autistic person known is Donald Gray Triplett, the first person ever diagnosed with autism. He lived to be 89 years old and passed away in 2023.


  • What was special about Donald Triplett’s life?

    Donald Triplett was called “Case 1” in the first autism research by Dr. Leo Kanner. His long life showed that with family support and community inclusion, autistic individuals can live happy, fulfilling lives.


  • Do autistic people have a shorter life expectancy?

    Research shows that autistic individuals, on average, face a shorter life expectancy due to health challenges and limited access to support. However, many people, like Donald Triplett, live long and meaningful lives.


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