Finally.\r \r Here it is guys! The Phinbella duet, What might have been. All credits to Dan Povenmire and Jeff “Swampy” Marsh. And a big clap for Ashley Simpson .\r \r Phineas and Ferb Act Your Age Monday, February 9 (8:30 PM - 9:00 PM ET/PT) In this special episode set ten years in the future, a teenaged Phineas must .\r \r From the Phineas and Ferb Valentines Day special Act Your Age.