Sony markets to older teenagers and adults primarily. That hasn't really change that much from 1995 to 2015 ... I would say they market maybe a little moreso towards mid-late 20 somethings (even early 30 somethings it appears) now though ...
https://www.youtube.com/watch?v=mByznNYCWTY
https://www.youtube.com/watch?v=VK03aVJekGg
The crux of Sony's philosophy is that you target adults/older teens *first*, then you work your way down to kids. And because kids are obsessed with being adults, they naturally gravitate to the platform too.
It's hard to argue their philosophy doesn't have very consistent, strong results with home consoles.
Nintendo's model of being the family company with an eye for "kids first" is a much tougher sell and in many ways has been problematic since the mid-90s onwards when Sega first challenged them and started introducing marketing for a different audience other than kids for the first time with the Genesis.
