You're asking the wrong group of ppl... Its kinda like asking a sportsman "Is sports only for kids?"

Besides, if you're an adult (Or teen even) who plays games and thinks they're ONLY for kids, what does that say about yourself?

Anyway, like rap (Coincidentally, Jack Thompson was also at the forefront to ban this) and rock'n'roll, games are now entering the mainstream acceptance phase, so questions like this won't really be an issue soon.