Here's a start:
If you’ve ever played pinball.
If you learned to type on a typewriter.
If you remember when phones used to ring and a lot of houses only had one unless there was one in the bedroom.
If you had to make a decision on VHS or Betamax.
If you had records (or even cassettes) for music.
If you remember when all mail required stamps.
If you know whose number this is: 867-5309.
If you read 1984 and it was a book about the future.