Act Your Age

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In this special episode set ten years in the future, a teenaged Phineas must decide between two colleges while grappling with the discovery that Isabella has had a crush on him since they were kids. Ferb and the gang try to bring the two together so they can admit their true feelings for each other before Isabella leaves for school. Meanwhile, Doof faces a midlife crisis and builds a Mid-Life Crisis-Inator.

Songs

 * "Mid-Life Crisis"
 * "What Might Have Been"
 * "Ballad of Badbeard" (instrumental)
 * "Danville for Niceness" (instrumental)

The "Too Young" Line
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Perry's entrance to his lair
None.

Evil Jingle
Doofenshmirtz hmm-hmm Incorporated!

Background Information

 * This episode takes place 10 years after the events of the series.
 * This is a Valentine's Day special.
 * Doofenshmirtz's old appearance marked the fourth time an elderly version of Heinz had been featured in the show. The first was in "Lights, Candace, Action!" and the second and the third were in "Phineas and Ferb's Quantum Boogaloo".
 * This is the first episode to premiere in 2015.
 * According to this episode, Isabella was at least eleven years old during the summer the show took place in. That would make her and the others at least 21 when this episode takes place.
 * It appears that everyone, including Ferb, was aware of Isabella's crush on Phineas, while Phineas remained oblivious.
 * Dan Povenmire and Jeff "Swampy" Marsh appear as themselves in live-action bookending the show by reading some fan mail.

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.
 * On December 14, 2012, Dan Povenmire tweeted the photo of Vincent Martella singing the aforementioned song.
 * 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.
 * 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".
 * On May 18, 2013, Bernie Petterson has confirmed that he and Kim Roberson are the writers and storyboard artists for this episode.
 * On August 28, 2013, Robert F. Hughes confirmed that this episode will be a 22-minute long episode (30 minutes with commercials).
 * On December 16, 2013, Aliki Theofilopoulos Grafft confirmed that this episode's animation is already done at least for a week from that moment.
 * On January 14, 2014, Dan and Swampy posted a tweet from their recording session for the episode with Alyson Stoner.
 * On January 22, 2014, Dan post two script doodles of "Act Your Age".
 * 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.
 * Of the teenage Fireside Girls, only Gretchen and Adyson have the same voice actresses as their teenage counterparts. The voice of Ginger is provided by Ming-Na, the real life mother of Michaela Zee, the current voice of Ginger, who also voices Dr. Hirano.
 * Rumors circulated among the public that this episode would be the series finale. Because of this, numerous crew members have made public announcements to deny it.
 * After the Russian version aired, Dan Povenmire explained on Twitter that he did not want it to air anywhere else before it aired in the United States.
 * Some of the voices, noticeably Buford's, were electronically modulated down to make them sound ten years older.

International Premieres

 * May 10, 2014 (Disney Channel New Zealand)
 * August 12, 2014 (Disney Russia - YouTube)

Continuity

 * Carl mentions placing Doof as a high school science teacher. ("Doof 101")
 * Baljeet mentions the time Isabella got cartoon hearts in her eyes, which was seen in "Rollercoaster".
 * Baljeet mentions the time Buford wore his cupid costume during his and Mishti's date. ("That Sinking Feeling")
 * A Hightail Delivery Company truck is once again seen. ("Delivery of Destiny", "Mind Share", "Night of the Living Pharmacists")
 * Buford wears a diaper again for some reason. ("That Sinking Feeling")

Trivia

 * Second episode to take place in the future. ("Phineas and Ferb's Quantum Boogaloo")
 * Phineas and Ferb and the gang are all around 18-20 years old in this episode.

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace
 * Thomas Sangster as Ferb
 * Caroline Rhea as Mom
 * Richard O'Brien as Dad
 * Dan Povenmire as Dr. Doofenshmirtz, Himself, Additional Voices
 * Jeff "Swampy" Marsh as Major Monogram, Himself
 * Tyler Mann as Commander Carl
 * Maulik Pancholy as Baljeet
 * Bobby Gaylor as Buford
 * Alyson Stoner as Isabella
 * Olivia Olson as Vanessa
 * Jack McBrayer as Irving
 * Eileen Galindo as Mrs. Garcia-Shapiro
 * Carol Kane as Nana Shapiro
 * Ariel Winter as Teen Gretchen
 * Madison Pettis as Teen Adyson
 * Dana Davis as Teen Holly
 * Ming-Na Wen as Teen Ginger
 * Dannah Phirman as Teen Milly (misspelled and credited as "Millie")
 * Soleil McGhee as Teen Katie
 * Additional Voices: Mackenzie Phillips, Diedrich Bader