I don't actually know how old my oldest car is. I believe I have a couple from the late 50's or early 60's, but can't verify that.
The oldest one I can identify is a 1/32 Strombecker Cheetah. My brother gave it to me for Christmas in 1966. I restored it a few years ago, complete with a NOS motor.
Not sure of the exact year, but I was a kid and THAT was a very long time ago. I still have my first Aurora Model Motoring 58-62 Corvette, the one with the vibrator motor. It still has parts from the origional hop up kit.