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, right now, as an adult I find myself playing games that are so much more enjoyable than the CoD type games I used to play a lot more growing up. Games I really think kid me would like. So, I’d say in that regard, definitely better. Also better in that I have soft modded consoles that allow me to play backups without needing the gane disc.
But I definitely feel my ability to play them for longer, extended periods of time is slowly slipping away. So not as good in that regard. Used to be able to spend hours in some games whereas now in similar games I’d not be able to do that today.
So, definitely mixed both ways.