Phineas Flynn Like other characters, his age is not mentioned. Phineas, along with his stepbrother Ferb Fletcher, star in the A-Plot of every episode. The series concerns Phineas's attempts to avoid boredom by finding something new to do every day of the summer vacation. He does this with his less-talkative stepbrother Ferb, and often with many other neighborhood children. He is known to be very selfless and energetic.
Phineas and his brother Ferb are part of the Geniuses, whos goal is to help invent and develop machinery and gadgetry for the Society's war. The two were also working on a vehicle that can cross fast through dimensional rifts. The project is called: the StreamShooter.