This is unknown because in none of the series have any of the characters said how old they are.
ferb is eleven and Phineas is eight
approximately 11.
Phineas and Ferb - 2007 Phineas and Ferb Get Busted 2-1 was released on: USA: 16 February 2009
Phineas' mum married Ferb's dad who is English. Ferb was already born and had been living in England. Phineas and Candice had been living with their mum in America.
There is no one named Natalie on the Phineas and Ferb show.
ferb is eleven and Phineas is eight
Phineas and Ferb - 2007 Not Phineas and Ferb Phineas and Ferb-Busters 2-29 is rated/received certificates of: Australia:G
Candace is Phineas's sister. Ferb and Phineas are stepbrothers.
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.
7 years old.
16
im pretty sure she is as old as phineas who it probably 9 or 10
There is a Phineas and Ferb game for the Wii: "Phineas and Ferb: Across the Second Dimension"
Phineas and Ferb are how you spell "Phineas and Ferb".