There are pros and cons for either demographic: whilst being older may be ideal since not only you bypass age restrictions, you also have the capability on purchasing it with your own money without having to ask parents for that given that you have employment and recurring income. Gaming as a kid gives more time without having to dwell much on responsibilities that adults have to worry about but at the same time are held by school.
Personally, gaming was a much bigger deal to me as a kid. I still play as an adult, but they just don’t evoke the same feels as they did when I was young. Probably doesn’t help that I am stressed, tired, and have a million obligations distracting me, but that’s adulthood for you. A lot of the time, I find something like a hike or bike ride more rewarding than games these days.