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 remember the Wii U being the greatest thing with a newborn because of the second screen. Holding a sleeping baby and playing Breath of the Wild was cool :D