Depends on lifestyle choices.
Lifelong non smoker who drinks within alcohol guidelines, maintains a reasonably sensible wait and exercises moderately, then under 75 would definitely be young.
The chronic alcoholics I see at work, it is a miracle they make it past 50.
Some of my acquaintances I know through climbing, who climb hard in adventurous locations, then it's sad when I hear they have died or been seriously injured but never surprising at any age.