I still remember reading an anecdote in a magazine many years ago - iirc, it was 'Life's Like That' in Readers' Digest.
Some people organised regular meals and get-togethers for groups of senior folk in their community. There was one old chap who clearly thought that he looked young for his age and he enjoyed getting surprised responses when he told people how old he actually was.
Once, he was sitting next to an old lady who, unknown to him, must have looked extremely young for her age. They introduced themselves and got chatting and then, very soon, he came out with his usual "I'm 84, you know!" The woman responded sympathetically and rather took the wind out of his sails, saying "Oh, don't you worry about it, dear; that's no age, really - my daughter is older than you!" 