My expectations were reduced to zero when I was 21. Everything since then has been a bonus.
Analysis
This quote is widely attributed to Hawking in multiple interviews and his writings, including his 2013 memoir *My Brief History*. The sentiment aligns with his public reflections on living with ALS and his unexpected longevity. No credible sources dispute its authenticity.
Background
Hawking was diagnosed with ALS (amyotrophic lateral sclerosis) at age 21 in 1963 and given a life expectancy of just a few years. He defied medical expectations, living until 2018 and continuing his groundbreaking work in physics. His resilience and perspective on life post-diagnosis are well-documented.
Verdict summary
Stephen Hawking did state that his ALS diagnosis at 21 lowered his expectations, making everything afterward feel like a bonus.
Sources consulted
— Hawking, Stephen. *My Brief History* (2013). Bantam Books.
— Interview with *The New York Times* (2004): 'A Brief History of Stephen Hawking'.
— BBC Documentary: *Stephen Hawking: A Brief History of Mine* (2013).