User data (vs purchaser data) usually becomes more readily available as the generation/console matures.
Also, citation needed.
Wii/PS3/360 user data from 2008:
Nintendo JP official demographic chart (2008):
To parse the second graph, it would appear that (as of 10 years ago), Nintendo's 3 largest age user groups were 10, 11, and 12, but the majority of users on the platform were well over the age of 25.
I did find this for iPhone vs iPod touch users (2009):
Keep in mind that Apple stopped reporting iPod sales in 2015, as the iPhone has made it redundant, even at the low end.
Mobile gaming exploded between 2007 (introduction of iPhone) and 2010:
Minors make up the majority of mobile game players.
It's difficult to find mobile trend data - most surveys only hit people 18 and up.