The thing is that, the kids are never going to age in south park. All cartoon sieres kids never get older. Look at the simpsons, going on 9 years without any change in age. Beavis and butthead have stayed 14 for 3 years or something, and king of the hill hasnt been around long enough so....
Oh yeah, and SOUTH PARK isnt meant to have characters that reach out to you and live like a real person. they are machines for a hilarious microcosm and running joke. If you enjoy the show in any way, thats good, but if you critisise it for not having real-life like characters and a real environment and people not staying dead, then remember: South Park Serious Soapopera would SUCK HARD.
thankyou, see ya, ~SETH~ p.s. this was meant in response for the message "Cartmans Age", but it got changed around.