He received critical acclaim for portraying the title character in the film Juno (2007), and became the fourth-youngest nominee for the Academy Award for Best Actress at the time.

[2] His film roles since include Whip It (2009), Super (2010), Inception (2010), X-Men: Days of Future Past (2014), Tallulah (2016), and Close to You (2023).

He also plays Jodie Holmes in the video game Beyond: Two Souls (2013) and Vanya (later Viktor) Hargreeves in the Netflix series The Umbrella Academy (2019–2024).

Describing himself as a pro-choice feminist, Page has spoken out in favor of the Me Too movement, advocated for abortion rights, has called for the end of military dictatorship in Myanmar, and is also vegan.

[3] Page has strongly spoken out against discriminatory legislation towards the trans community and has become a vocal advocate for LGBTQ rights.

[9][10] After graduating from the Shambhala School in 2005, Page spent two years in Toronto, studying in the Interact Program at Vaughan Road Academy, along with close friend and fellow Canadian actor Mark Rendall.

[15] In the same year, he was cast in the television series Trailer Park Boys in the recurring role of Treena Lahey, which he played for five episodes.

[19] In 2005, Page received recognition for his role in the movie Hard Candy, where he portrayed Hayley Stark, a teenage girl who takes a pedophile hostage.

[25] In 2007, he had his widespread breakthrough for his leading role as the title character, a pregnant teenager, in the coming-of-age comedy-drama film Juno.

Also in 2007, he appeared in The Stone Angel, and led the films An American Crime and The Tracey Fragments, the latter of which also earned him critical acclaim, with the Boston Herald writing that "It is also a further reminder that Page is the real thing.

[36] On May 3, 2009, he guest starred in "Waverly Hills 9-0-2-1-D'oh", an episode of The Simpsons, as the character Alaska Nebraska, a parody of Hannah Montana.

[47] In January 2010, Page began appearing in a series of advertisements for Cisco Systems, including commercials set in Lunenburg, Nova Scotia.

[48][49] That April, the Michael Lander film Peacock featured Page as Maggie Bailey, a struggling young mother.

[50] Page noted the film as "one of the boldest screenplays I've come across in my albeit short career; it's a character and story I can throw myself into and exactly the type of movie I love to be a part of".

[71][72] In December 2014, Page portrayed Han Solo in a staged reading of Star Wars Episode V: The Empire Strikes Back.

[75] The film received a mixed response from critics, with review site Rotten Tomatoes writing that "Freeheld certainly means well, but its cardboard characters and by-the-numbers drama undermine its noble intentions".

[83] On November 9, 2017, it was announced that Page had been cast in the main role of Vanya (later Viktor) Hargreeves in the Netflix superhero series The Umbrella Academy.

But the choppy, cliched visuals and the script's superficial approach to the characters' predicaments ultimately undo any goodwill that the actors can generate.

[106] The film received positive reviews from critics, with The Hollywood Reporter writing that the film, while "made in a standard documentary format that includes a voiceover and a tad too much weepy music", "gets its job done directly enough, underlining a situation that remains dire despite what seems to be a growing level awareness around the country".

[121] In January 2025, it was announced that Page would be developing a television adaptation of Beyond: Two Souls after his production company acquired the rights from Quantic Dream.

[131][132] On December 1, 2020, Page came out on social media as a trans man, specifying his pronouns as he and they, and revealed his new name, Elliot.

"[138] Various celebrities such as Justin Trudeau, Ellen DeGeneres, Miley Cyrus, James Gunn, and Kumail Nanjiani, expressed support for Page after the announcement.

[142] Page appeared on the cover of the March 29 / April 5, 2021 issue of Time, making him the first openly trans man to do so.

"[124] Page had a relationship with Olivia Thirlby during the filming of Juno,[146] and with Kate Mara, with whom he co-starred in Tiny Detectives (2014) and My Days of Mercy (2017), in 2014.

[124] Page is vegan, and People for the Ethical Treatment of Animals (PETA) named him and Jared Leto the Sexiest Vegetarians of 2014.

[155] He was one of 30 celebrities who participated in a 2008 online advertisement series for US Campaign for Burma, calling for an end to the military dictatorship in Myanmar.

Page hosted the television documentary series Gaycation (2016) alongside Ian Daniel, which earned him two Primetime Emmy Award nominations.