...You can remember when your internet connection speed was measured in Baud.
...You still type
http://www out of habit because you remember when you had to type that every time for every website.
...You remember when the internet consisted of BBS, FTP, Gopher, and there was no world wide web whatsoever.
...You can clearly remember jogging on the Nintendo Power Pad, and playing with the Nintendo Robot.
...You remember when cable boxes had a little slider that you would slide to the station number, and the remote control had a wire.
and of course:
...You see this photo and don't think anything of it because it's so familiar to you: