Adding to that list, most valve games (even half life 1 from 1996) still getting updates today, and indie game terraria released in 2011 which got big content updates over a decade.
If we are going to mention Terraria, we should also talk about Minecraft. I purchased it in 2009 and I'm still getting new content on a regular basis today. It's true that they have a subscription offering through Realms at this point, but it's entirely optional.
