Clara Stack: Age, Biography, and Career Facts

There’s a certain thrill in watching a young actor land their first big role — especially when you’ve been following their journey from local theater stages to a major HBO series. Clara Stack, born October 19, 2010, has been acting since age 4, and her upcoming role as Lilly Bainbridge in It: Welcome to Derry is set to introduce her to a much wider audience.

Born: October 19, 2010 ·
Age (2025): 14 ·
Known for: It: Welcome to Derry, The Naughty Nine, Hawkeye ·
Instagram followers: 506K

Six verified facts about Clara Stack, one pattern: her career is moving rapidly from small screen guest roles to a major streaming series lead.

How old is Clara Stack in real life?

Clara Stack was born on October 19, 2010 according to TV Insider (entertainment news outlet) and confirmed by Famous Birthdays (celebrity database). As of 2025 she is 14 years old. Her birth date places her under the Leo zodiac sign.

How old is Clara Stack in Welcome to Derry?

In It: Welcome to Derry she plays Lilly Bainbridge, a character in the same age range as the actress. The series is set in 1962, and the role does not require her to play significantly older or younger than her real age.

When was Clara Stack born?

October 19, 2010. Multiple sources including Famous Birthdays and Disney Kids & Family list this date.

This confirms that her real age aligns with the character she portrays.

What ethnicity is Clara Stack?

Clara Stack is American by nationality, with New York listed as her home location by Disney Kids & Family. No public source has made an explicit statement about her racial or ethnic background beyond nationality.

What is Clara Stack’s nationality?

She is American, born in the United States. Famous Birthdays describes her as “an American actress.”

The pattern suggests that privacy concerns outweigh public curiosity in this case.

How did Clara Stack audition for Welcome to Derry?

Clara Stack auditioned for the role of Lilly Bainbridge by submitting a self-tape in December 2022, as she shared in an interview with Pop Culture Unplugged (entertainment interview channel). She reported that she didn’t hear back for about two months before being called in for further testing. The series was filmed in Toronto, Canada.

What did Clara Stack reveal about the audition process?

In a YouTube interview, Clara Stack said she auditioned for both Lilly and a character named Marge. She submitted a self-tape and waited approximately two months for a response, a timeline that is common in competitive TV casting. Popternative (pop culture news site) later reported that the series premiere drew strong viewership, making it the third most-watched HBO Max debut.

This timeline underscores the patience required in competitive casting.

What movies has Clara Stack been in?

Clara Stack has appeared in three major productions that establish her filmography: Hawkeye (2021), The Naughty Nine (2023), and It: Welcome to Derry (2025).

What role did Clara Stack play in Hawkeye?

She portrayed a young Kate Bishop in Marvel Studios’ Hawkeye in an uncredited role, according to Disney Kids & Family.

What is Clara Stack’s upcoming project?

Her most anticipated role is Lilly Bainbridge in HBO’s It: Welcome to Derry, a prequel series set in 1962. The series premiered October 26, 2025 and has already been renewed for a second season. IMDb lists her in 8 episodes.

This shift from uncredited to lead role highlights the momentum in her early career.

Is Clara Stack a twin?

No public information indicates that Clara Stack is a twin. The question may arise from confusion with fictional characters or from internet rumors. Famous Birthdays and other sources do not mention a sibling.

Does Clara Stack have a boyfriend?

Her personal relationship status has not been publicly confirmed. As a 14-year-old actress, it is typical for families to keep such details private.

What is Clara Stack’s height?

Her height has not been officially reported. No reliable source lists her physical measurements.

This uncertainty underscores the family’s effort to maintain privacy.

“I submitted my self-tape in December 2022 and didn’t hear back for about two months.”

— Clara Stack, in an interview with Pop Culture Unplugged

Clara Stack described the premiere response as “insane” in an interview with Popternative.

Clara Stack’s journey from a New York theater production of Matilda to the lead of HBO’s most buzzed-about horror prequel is a case study in early career momentum. For young actors in Hollywood, the path she’s on — starting with uncredited roles, building a Disney film credit, then landing a major streaming series — is both promising and fraught with the challenges of growing up in the public eye. For Clara Stack and families considering child acting, the implication is clear: a strong self-tape and persistence can open doors, but protecting personal privacy becomes just as important as landing the next role.