Hi guys. I, too, am a 55+ (60 actually) and play pCARS on the PS4 platform, although I recently bought the PC version for dabbling in custom livery creation. I'm not really a gamer at all, my console's main purpose is for pCARS, and the upcoming new version, as well as probably GT Sport. I've been playing pCARS occasionally for a year or so now, but have recently dived into it more seriously with intent on joining some online races. I see some of the threads to this post mention some organized regular races; I'd be interested in joining some.
Personally, I prefer racing street cars or street-car-based race cars. By the same token, I also find myself gravitating to the 'regular road' tracks, like Bennochbrae, California and Azure coast, Ruoen Les Assarts, etc. I find the curves and bumps more fun than the flat, made-for-high-speed race courses. But, hey, they're all good.
I have a friend who is in his mid 60's who is DEFINITELY NOT a gamer, or techie, at all. But he loves high performance cars and my son got him hooked on Gran Turismo; he went out and bought a PS3 and plays the game until his fingers hurt him so bad that he has to take breaks from the game occasionally.