ON Shabbos, I heard a wonderful story.
One of our guests was Susan Lapin from Seattle. She said she had an aunt on the East Coast who was a longtime science teacher in high schools.
First she taught in Jewish day schools, then when she was around 50 she switched to public schools. The principal would smudge the papers that contained her age so as to keep her on — she was that good.
She taught into her eighties.
One fine day she found herself in the hospital with a cardiac problem. It turns out that tests had been switched and, in fact, she had nothing wrong with her. At the time of this story she did not know that.