In "When Petes Collide", older Pete mentions that he is four years older than younger Pete. In "Hard Day's Pete" (a first season episode), older Pete says several times that younger Pete is ten years old, making older Pete fourteen.
In the following season there are at least two comments that re-enforce this: in "Halloweenie", older Pete's classmate is fifteen years old. In "Farewell, My Little Viking" it is mentioned that younger Pete is in the seventh grade which is consistant with him being 11 years old (although most seventh graders are 12 going on 13).
In the third season, older Pete is supposed to learn how to drive, which would make him sixteen in most states. (In New Jersey you must be seventeen.)
It seems that each season covers (in some degree) a year of Wellsville life.
Hal Hartley has made several movies, a couple of which have starred Martin Donovan and Damian Young. Michael Spiller, the cinematographer for The Adventures of Pete & Pete, has also worked for Hal Hartley. Finally, at the end of Amateur, Hartley gives thanks to Toby Huss (a.k.a., Artie, the Strongest Man in the World).
What we can make out of this is up for grabs.
You can learn more about Harley at his Web site.
Older Pete mentions in "Das Bus" that he could make out twenty-seven out of Penelope Ghiruto. Jason Martens <email@example.com> took the time to come up with his own list:
Lisi Segal and her mother <firstname.lastname@example.org> came up with new words for the theme song:
Hey red and green, I just popped out my ivory spleen I'm comin down your chimney But I won't fit cause my belly's too big I'm Santa Claaaaaaaaaaauauauauauauas I'm Santa Claaaaaaaaaaauauauauauauas yes it's me [guitar solo] Santaa Claaaaaaaaauauauauauauaus I'm real big Don't ya know I'm Santaa Claaaaaaaauauauauas it's me Santaa Claaaaaaaaaaaauauauauauauauauas it's in me Don't ya call me Santaa Claaaaaaaaaaaaaauauauauas? yes it's meeeeeeeeeeee!