Dont forget to add. Only three TV stations and the signed of the air at 11:30If you've been to over 50 dead shows, you're old. There are other metrics of course. Do you know how to use a slide rule? Did you have a party line in your home as a kid? Did you own an 8 track player? If yes, definitely old.
Are you getting mail from AARP on a regular basis? Borderline old.