Phineas (Vincent Martella) is 17 and Ferb (Thomas Sangster) is 19. But in the show they are probally 10 or 11.
ferb is eleven and Phineas is eight
79
She is 15
8
7 years old.
im pretty sure she is as old as phineas who it probably 9 or 10
16
probably about ten years old
approximately 11.
15 in s1 and 16 in s2
They are both 10 x
Between 40 and 50 years old