It's probably more personal circumstances than age, and your priorities definitely shift as you get older. I'm not in my 40s yet (mid-30s) and my decisions around games I want to play has changed.

I get to play games maybe a few hours per week (mostly in the weekend), so the idea of starting a new Assassin's Creed and spending 80 hours (many months) on a singleplayer game is pretty unappealing. (TBH, I was never super into SP games, but the appeal now dropped to 0).

At the same time, I've been having a blast with "The Finals" since launch and it's pretty much the only game I play. Easy to pick up and play 1-2 rounds :)