My grandad turns 95 next week.
He was still working several days a week until last April as a caretaker in a local school - he only quit because he fell and broke his hip a few weeks after his 94th birthday. A few years ago he noticed that his co-worker who was highly allergic to bee stings had been stung, went and get help, and potentially saved her life as a result. Pretty cool thing to do in yer early 90s.