||over 5 years, but still there are LOTS of low mile examples out there, obviously not lots of 8k mile cars, but find me any 25 yr old car under 10k miles and it will bring some premium.
I see no evidence there is any upswing, look at the plot data from BaT alone and you see no indication of it. There are instances of Z31's selling for more than Z32's and much more Z31's were produced/sold.
We are simply a long way away from these cars becoming rare enough to start getting Mopar type appreciation, I doubt it will happen in less than 20-30 years, your run of the mill 240/260/280Z still doesnt bring much typically. We are approaching the 50 year mark there.
"I torch my soul to show the world that I am pure deep inside my heart...."
--William Patrick Corgan