Doubleplusgood?

I prefer the term "old school" because it implies that somehow I'm educating myself by playing old games. After all, playing old games helps you learn the history of video games.

Retrogaming it the best term to describe it all. So Retro is and Retro remains for me....

What do you guys think of "necrogames"?

sounds kind of hot, what do you have in mind?

and does it involve dressing up?

A portmanteau of Nextgen and Penultimate (as most are not really 'last' gen).
Penultimagen!
Actually, that sounds like some kind of disease.

I thought it sounded more like something you take when you're constipated.
You could always pitch it with a movie comparison, if they like star wars then you could say that they like movies from the 70s & 80s so why not games? Or if they play mobile phone tetris or snake both of those are basically from the 80s

"Honey! Get me the Penultimagen! I got a major traffic congestion here!"
Penultimagen: Now with flavor crystals!(tm)

I vote vintage. It's so classy.

There really isn't a single word to describe all the games on this site. In fact "Good Old Games" encompasses the whole idea of the library of games on GOG. Some games are retro, a few are classic, others oldschool, and some are a combination of everything in between. In the end, it's just a label. Games are games. Just enjoy them without worrying too much about categorizing.

I like: Ageless, vintage or classic

Old-School.

how about price-less?
oh wait, nevermind. hahahahah

Well there's BASS & LOTT that are priceless in both senses of the word. Emphasising the cheap is not a bad thing. How about this for a tag line: "Buy Fallout from GOG, cheaper than lunch and lasts a lot longer"