...when you think about the fact that the first video game you ever bought needed to be loaded by cassette tape.

...when you hear Nirvana and it still feels like "new" music to you.

...when you have to explain to someone what a text adventure game was.

...when you see that we're now as far removed from the end of WWII as WWII is from the Civil War.

...when nobody ever cards you at the bar anymore.

...when you have to stop a movie to explain to someone what a rotary phone was.

Huh, forget that, i say your young if you can still remember what not feeling tired (at all) is like???

More like middle age, which is nearly as bad(or good) as being older than that.

And don't talk about memory(I am joking, talk if you want)......I have bad memory as is due to brain issues(short term), and getting old will only likely make it worse. :|

I doubt anyone, want's to wear nappies.

When you realize that that happened to you the first time ten years ago :/

...when you start telling strangers about your pubes and don't question whether or not they want to hear about them.

The internet: He doesn't know.......

When the porn you remember from your youth is now labeled vintage or classics.

...When young girls ask you for pocket money, inspect, dig and stick around you, instead of hanging out with same age boys.

... When you refer past events giving the year instead of time frame.

For example:

"In 2000 when Baldur's Gate 2 came out..."
instead of
"20 years ago when Baldur's Gate 2 came out"

...when you need to pick up a few things at the store you don't worry about what you wear or how you look.

...there are more familiar names in the obituaries than in the the newly weds.

Your doubt (like your punctuation) is misplaced.
Weep, weep for humanity.

This old clip from early The Simpsons is very relevant to this thread. Anyone else who can relate to Homer? I'm basically like that when discussing anything new regarding movies, games and music.
https://www.youtube.com/watch?v=vjiyq25crAQ

What makes the clip even better is that the new bands mentioned there would go into the (digital) oldies box today as well,