Tennis, bike rides, video games, concerts, jogging, employment, chess, etc.
With the exception of professional sports or extreme activities (mountain climbing, etc.) there's very little that you can do in your 20's that you can't continue doing well in your 60's.
And when somebody dies from stroke/heart failure/cancer in their older 50s, 60s and early 70s, it strikes me as a much more tragic and untimely death nowadays. Sally Ride, the first female NASA astronaut, was still several decades away from the limits of a human lifespan when she passed away suddenly.