User blog comment:Adventuretimegenghiskhan/How Old Is PB?/@comment-1904328-20110503204503

She is 18 for most of the series. (http://www.formspring.me/natazilla/q/160973656367863760) However, she was 13 at the end of  Mortal Recoil  , so who knows? We will have to wait until the next episode airs to find out if her age changed.