Then again... there are some vehicles that are born classics. Some I remember "back in the day" that weren't even... or just barely 15 years old.
Yenko Chevys
Hemi Mopars
429 Boss Mustangs
Ford Panteras
AMC AMX
Even 80's Buick GN's
Deloreans too
Granted... the 60's WAS the muscle car era, but there were non-mainstream classics back in the 50's too. Tucker and Hudson are the first 2 that come to mind.
Back in 2006 I went to Auburn, Indiana... to the Cord, Auburn, Deusenberg museum. I've always lusted for a '39 Cord... But the Auburns and Deusenbergs are works of art. The museum is a worthwhile trip if you live within a couple hours drive.
The bonus was that the Kruse International Auction was going on at the fairgrounds at the same time, (Labor Day weekend).
I tried shopping the vendors... but spent most of my time inside watching the cars come across the auction block. You name it... it was there. From steam powered to brand new exotics.
It was probably the best weekend a "car guy" could ever spend.