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.
I have much less screen time now as an adult. But games have grown in every way and are now a legitimate art form. It’s hard to say if I had more fun playing jet set willy on my 48k Sinclair spectrum, or playing cyberpunk on my steam deck. Both were great, in different ways.