I've just passed my 71st birthday and I'm still working. I tell people that, and get one of two reactions. One camp says when they retired, it was the best decision they ever made and can't see why everybody doesn't retire when they're able to. The other camp says, "Good for you! Keep busy, no reason to retire if you don't want to."
My latest observation about life is that we never mature to the point where there is no more room for growth. I know Miss Manners would tell me never to discuss religion; but, what the hell, I feel strongly that religion demands our maturing as well as other emotions, thoughts, physiques, etc.; and if my confessions about my religion offends you, press your "delete" button now.