The phrase "old gen" refers to something that is from an older generation or time period. It is often used to describe older technology, ideas, or products that are no longer as advanced or relevant as newer ones. Full definition
What about you current / old gen console owners? (gamercrash.com)
Good to see they're not giving it the best on last gen consoles to make everyone happy, saying that its a big let down for current old gen owners. (n4g.com)
Old gen users can really enjoy this month's offer, since the games in question are among the best when it comes to action RPGs and action adventure in third person. (gamepur.com)