I first watched ACO when I was 14 or something and yeah that was pretty great timing. It blew me away at the time. But when I rewatched it a couple years ago I connected with it much less. (it's still good though)
Barry Lyndon on the other hand I watched around the same time as a teen and found to be deathly dull. I havent rewatched it since but I recently bought it on criterion bluray and am really looking forward to revisiting it.
Speaking of being anal about Kubrick films, once I asked for my relatives to get me movies by famous directors for Christmas as an easy gift. so my aunt bought me Full Metal Jacket on DVD in **fullscreen**. I didn't even bother taking the plastic off the box.