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Description
It's been 10 years after the events of Summer, and Phineas must decide what University to go to. After discovering that Isabella had a crush on him for years, Phineas must reach her before she leaves for college and express his true feelings for her. Meanwhile, Doofenshmirtz has a mid-life crisis.

Trivia
Third episode to heavily involve Isabella and Phineas's relationship ("Happy Birthday, Isabella ", "It's No Picnic ").
Second episode to take place in the future. ("Phineas and Ferb's Quantum Boogaloo ")
This is a Valentine's Day special.
Production Information
On November 15, 2012, Robert F. Hughes posted a tweet in which he said that Madison Scheckel had come to write with them a Phineas/Isabella song .[2]
On December 14, 2012, Dan Povenmire tweeted the photo of Vincent Martella singing the aforementioned song.[3]
On March 1, 2013, Dan Povenmire, Jeff "Swampy" Marsh and Jake Whetter had a Spreecast chat. Fans were welcome to send in questions using Spreecast, Facebook, or Twitter with the hashtag "#PlatypusDay". During Spreecast, Dan and Swampy had confirmed an emotional Phineas/Isabella episode in Season 4, and mentioned that the song made them both cry.[4]

Note: these are not the final character designs, but the ones that caused Dan and Swampy to ask for the author to create the final designs for this episode.
On May 10, 2013, Robert F. Hughes mentioned via Twitter that this episode is not the Season 4 finale and its name is "Act Your Age".[5]
On May 18, 2013, Bernie Petterson has confirmed that he and Kim Roberson are the writers and storyboard artists for this episode.[1]
On August 28, 2013, Robert F. Hughes confirmed that this episode will be a 22-minute long episode (30 minutes with commercials).[6]
On December 16, 2013, Aliki Theofilopoulos Grafft confirmed that this episode's animation is already done at least for a week from that moment.[7]
On January 14, 2014, Dan and Swampy posted a tweet from their recording session for the episode with Alyson Stoner.[8] [9]
On January 22, 2014, Dan post two script doodles of "Act Your Age".[10] [11]
During their July 22nd, 2014 Spreecast to promote "Phineas and Ferb: Star Wars ", Dan Povenmire noted that this episode would air in February 2015.
A few scenes of this episode were shown at the 2014 SDCC.
The teenage versions of Phineas and the gang were drawn by DeviantArt user Ashley "kicsterash " Simpson. Dan Povenmire created a DeviantArt account for himself just so he could ask her to design for this episode.
Songs
40s Crisis
Unnamed Phineas/Isabella Song

Description
It's been 10 years after the events of Summer, and Phineas must decide what University to go to. After discovering that Isabella had a crush on him for years, Phineas must reach her before she leaves for college and express his true feelings for her. Meanwhile, Doofenshmirtz has a mid-life crisis.

Trivia
Third episode to heavily involve Isabella and Phineas's relationship ("Happy Birthday, Isabella ", "It's No Picnic ").
Second episode to take place in the future. ("Phineas and Ferb's Quantum Boogaloo ")
This is a Valentine's Day special.
Production Information
On November 15, 2012, Robert F. Hughes posted a tweet in which he said that Madison Scheckel had come to write with them a Phineas/Isabella song .[2]
On December 14, 2012, Dan Povenmire tweeted the photo of Vincent Martella singing the aforementioned song.[3]
On March 1, 2013, Dan Povenmire, Jeff "Swampy" Marsh and Jake Whetter had a Spreecast chat. Fans were welcome to send in questions using Spreecast, Facebook, or Twitter with the hashtag "#PlatypusDay". During Spreecast, Dan and Swampy had confirmed an emotional Phineas/Isabella episode in Season 4, and mentioned that the song made them both cry.[4]

Note: these are not the final character designs, but the ones that caused Dan and Swampy to ask for the author to create the final designs for this episode.
On May 10, 2013, Robert F. Hughes mentioned via Twitter that this episode is not the Season 4 finale and its name is "Act Your Age".[5]
On May 18, 2013, Bernie Petterson has confirmed that he and Kim Roberson are the writers and storyboard artists for this episode.[1]
On August 28, 2013, Robert F. Hughes confirmed that this episode will be a 22-minute long episode (30 minutes with commercials).[6]
On December 16, 2013, Aliki Theofilopoulos Grafft confirmed that this episode's animation is already done at least for a week from that moment.[7]
On January 14, 2014, Dan and Swampy posted a tweet from their recording session for the episode with Alyson Stoner.[8] [9]
On January 22, 2014, Dan post two script doodles of "Act Your Age".[10] [11]
During their July 22nd, 2014 Spreecast to promote "Phineas and Ferb: Star Wars ", Dan Povenmire noted that this episode would air in February 2015.
A few scenes of this episode were shown at the 2014 SDCC.
The teenage versions of Phineas and the gang were drawn by DeviantArt user Ashley "kicsterash " Simpson. Dan Povenmire created a DeviantArt account for himself just so he could ask her to design for this episode.
Songs
40s Crisis
Unnamed Phineas/Isabella Song