All consoles are for all ages, though if we are going to talk about the games for 3DS then 95% of the games would be for kids at age 5-14.
If most people didn't gnow up with Pokemon the DS would be a huge failure. People don't play pokemon because it's a high quality game, they play it because it's nostalgia and they grew up with it (which is fine, nothing wrong with that). If the game then happens to be mediocre to good then all the better.
Most people I know who own a DS have bought it for Pokemon only. There are the Zelda fans as well ofc, but compared to the pokemon fanbase that number is worthless. :P
Edit: Last Nintedo console I bought was a gameboy SP back when it got released. I something try a DS game on my friends DS (I'l probably play his new Zelda game when hes done with it) but I'l never buy one myself. A console is not worth it for 1 or 2 games.