I know what you mean!
I looked at my husband the other day and said, "When did we get old? I missed it." And I'm only 28!

We'd left the kiddo with the parents and went to a neighborhood 'party' if you will. At 11:00 I was already regretting the few drinks I'd had (which is a rare for me in itself) and was ready to go. I remember at back in the day the night was just getting started at that time.
I watched the Cosby Show the other day and said, "I remember (as in, when it was new) this episode." I hit 'info' and it said <gasp> 1984! Are you KIDDING ME!? 1984!?!? That was 23 years ago! 23 YEARS!!! And I
remember that!? Geez.