No, I didn't actually have YouTube videos in high school, I had whatever the internet at the time used for the same purpose. DivX and real player videos downloaded over the phone line, and AOL messenger for chatting. That's why I didn't say "I" and used the generic "you".

I didn't expect someone to read that as a historical detail as opposed to a point about the type of mental context switching high school students do.

I'm not that far out of my mental prime, I'm just far enough that I'm noticing it.

That's what the comment is trying to say, no less, but it rubbed me off wrong, too.

If you think I was complaining about being old without actually being old, then you lost my actual point somewhere in the urge to say "get off my lawn."

I wasn't complaining; just trying to be encouraging! Looks like I did indeed misinterpret the statement though.