Floating around the Web:
23-30: Remember DVDs and Ipods and fax machines
30-40: Remember Nintendo and AOL
40-50: Remember Floppy Disks and Atari
50-60: Remember Black and White TV's
60-80: Remember Rotary Phones [and speak or at least understand Yiddish]
80+: Remember the Holocaust
For the record I am 48 but remember that we had a black and white TV as a young child. I don't think than I am any smarter for it....