I think the early years of Trans-Am and Can-Am racing did it for me. I'm only 42 but have a soul that was born in the late 60's. Looking at old books loaded with Chaparall's, Penske Camaros, McLarens, Boss Stangs and Cudas man those cars were maxed out Pro-Tourers of the day. That and Forza 4 for Xbox.
The bug got me in 2010. My friend had a 66 Chevelle SS convertible with a 502, 20 and 18s, a/c and just a sick stance. He let me drive it for a day and I was gone hook, line and sinker!!! Needless to say I think my wife is secretly pissed at him, lmao!!!