>> now that I have kids I'll soon be on the other side trying to convince them that the old stuff I like is cool and special

Nope. Kids today have access to everything under the sun. The classics still resonate with them. My kid loves Queen and Zepplin. Enjoyed the hell out of "They Live", the Matrix and many other classic movies. Not so much John Carpenters "the Thing" which even I found a bit slow these days.

A lot of this was discovered without my introduction too. Music in particular.

Share the movies without explanation. Classics are universal.