How old is Biff?

[Biff]

he invented domesticated animals...or he domesticated wild animals.....

either way i'm impressed...i just want the facts when i tell my grandchildren about the Great Biff Mayhem

Dammit get off Biff's ass . . . I'm just as effin old as him . . why you gotta eff up 2 peoples worlds!!!

How do you know for sure? Potthole is the only one who knows my true age.