Age is not important unless you're a cheese.
We may be living in the twentieth century, in resplendent sophistication. But deep down, most of us find ourselves still in the Stone Age of superstition.
People who refuse to rest honorably on their laurels when they reach retirement age seem very admirable to me.
At 50, you need to laugh about your age. If you don't, everybody else will do it for you. Happy birthday, old chum!