i am well over 40 and still play games. The "problem" is that gaming now compete with lots of more important stuff like: kids, family, dogs, home repairs, sport activity, wife, work, errands to run, and sure I am leaving out many.
So, forget sitting on a computer or console for even half hour. I consume quick mobile games, where reflexes are not decisive (that's age, thanks).
I even bought a real Nintendo DS Lite with the cracked cartridge to load games on microssd, and my kid loves it, but even New Super Mario Bros takes too long between saves for the free time I have, so you get the idea.
Would I still do hours gaming sessions even if I could? No, too many hobbies and ideas that pop up all the time to work on... Maybe this is because I cannot for the sake of life get closed to modern games. AAA are cashgrabs, indie require too much time researching them, and anyway I need mobile gaming, that sucks overall.