In the episode 'Interview with a platypus' it shows Phineas playing music as a toddler, along with young Perry. So it could be possible he is around the same age as Phineas, around 10 years old.
It's not Perry the Platypus's birthday, it's the anniversary of the day they got him from the pet shop. Obviously, he wasn't born that day. I guess about 6 years. Birthday probably not in summer if they never celebrated it.
ferb is eleven and Phineas is eight
approximately 11.
15 in s1 and 16 in s2
This is unknown because in none of the series have any of the characters said how old they are.
No, she's ten years old,u freak!
7 years old.
We don't know yet, but the upcoming movie may shed some light on Perry's past.
ferb is eleven and Phineas is eight
79
She is 15
8
Phineas (Vincent Martella) is 17 and Ferb (Thomas Sangster) is 19. But in the show they are probally 10 or 11.
im pretty sure she is as old as phineas who it probably 9 or 10
16
probably about ten years old
approximately 11.
They are both 10 x