My friends are mostly all around 15-17, so they cant be around much, they're too obsessed with other things such as their cars, jobs, and... their cars....
But younger friends... 12-14, usually meet up at my place (its the best!) And we'll either watch a movie, umm mess around with Google Image Search, play video games, or like... go outside and become an idiot.
Luckily my best friends all live on my street so I see them alot, two of my friends are brothers (11 and 16) and they live just across the street.