How old do I feel?

OK, so I'm not that young anymore. And granted I've got to a point when I would rather not add another +1 to my age every year but I still feel young. Then I get a message on Facebook from an ex-student saying 'Oh my god, my old teacher'. Fine but he is 26 with a wife and three kids. I'll be getting out my tweeds soon and sowing on the patches. Bollocks.