I doubt all of those "18" year old are 18. A lot of kids put false ages. For instance I was 18 on my xbox account before I was 18 Irl haha. I would say 70 percent are really above 18
Ltd predictions by the time 9th Gen comes out
Ps4:110million
Xbox one :75 million( was 65)
Wii u: 20 milliion