User blog comment:Davoo/Happy birthday Butters!/@comment-2217376-20100912130920/@comment-3027198-20100912201453

No not actually... it might be a little hard to comprehend but none of the characters age in the show, even though a lot of them have had a birthday. For example, Stan's Facebook page said he was born in 2001. So how he was there at the 1999 New Year's Eve party is beyond me!