When I was 20, I used to go back to the same games over and over, regularly. Even JRPGs!
Nowadays, I don’t go back to any games out of nostalgia’s sake. When I clear a game, I cleared it and I am pretty happy to stick with my memories of it. But I have no issues playing old stuff, even antiquated things, if I am having fun with them. I recently “discovered” Ultima Underworld, and that was a fantastic experience, until it got too complicated for me. Ultima 4 was very evocative, but a bit too different to anything I ever played for me to get anywhere with it. I have started playing Super Metroid last week (because of the Music Thunderdome!), and that is a very atmospheric game, although it is very demanding in terms of reflexes. I am eyeing Betrayal at Krondor right now.
I also have a soft spot for old games esthetics, and I don’t mind them in the single bit, quite the reverse, as I think they stimulate the imagination.
Nostalgia, to me, is much more evoked by reading old magazines, or watching old shows about computers (I discovered 10 years ago the Computer Chronicles thanks to archive.org, what a blast!). It seems strange to me that media I have never been in contact with evoke the same nostalgic sentiment that the magazines I read or watched did, all the while playing my old games themselves don’t bring that warm feeling back, but that is my personal experience.