Yeah good points on open ended timeframe and the 2013 end date. 2010 seems pretty good, the only odd one out for that list would be civ 5 because it’s so widely played.
I’m in my 30s now so I have to remember that someone who was 5 in 2010 would be 18 now, and red dead redemption 1 would definitely be considered old. I think that’s a solid timeframe, 1990 to 2010. If Lemmy ever gets big enough to warrant it there could eventually be games by decades communities as well.