Clara Stack Age, Biography, and Welcome to Derry Role (2025 Facts)

Clara Stack, 14, has landed the role of Lilly Bainbridge in HBO’s It: Welcome to Derry after a self-tape audition in December 2022. Her journey from child theater to a major Stephen King prequel offers a rare, clear-eyed look at how Hollywood discovers young talent today.

Born: October 19, 2010 · Age (2025): 14 · Notable Role: Lilly Bainbridge in It: Welcome to Derry · Instagram Followers: 506K+ · First TV Appearance: 2017 (The Marvelous Mrs. Maisel)

Seven facts about Clara Stack, one takeaway: her profile is built on a mix of blockbuster projects (Hawkeye, Welcome to Derry) and a growing social media presence that she manages with apparent caution.

The following table summarizes her key biographical details.

How old is Clara Stack in real life and in Welcome to Derry?

Clara Stack’s birth date and age

• According to Famous Birthdays, Clara Stack was born on October 19, 2010, making her 14 years old as of 2025.
• Her Instagram profile (@clarastacknyc) includes the pronouns she/her and shows 506,000+ followers, further confirming her public identity.

When does Welcome to Derry take place?

• The series is set in the 1960s, preceding the events of the original It films. Clara Stack’s character Lilly Bainbridge is described as around 12–13 years old, consistent with the actress’s actual age range.
• According to an interview with Pop Turnitin, Stack described Lilly as “an unusually intense and emotionally intelligent person who has been through a lot.”

What is Clara Stack famous for?

Key roles: Hawkeye, Welcome to Derry, The Naughty Nine

• Clara Stack played a young Kate Bishop in the Disney+ series Hawkeye (2021) (IMDb).
• She starred as lead in the Disney original film The Naughty Nine (2023) (IMDb).
• Her current major role is Lilly Bainbridge in HBO’s It: Welcome to Derry (2025), a prequel to the It franchise (IMDb).

Early career in Madam Secretary and Bull

• Before her breakout, Stack appeared in guest roles on Madam Secretary and Bull, as listed by her agency CESD Talent Agency.
• Her first TV credit was an appearance on The Marvelous Mrs. Maisel in 2017, when she was just 6 years old.

The pattern: Stack has moved from single-episode guest spots to major franchise roles in under a decade, a trajectory that signals both talent and strong representation.

What ethnicity is Clara Stack?

Family background

• No authoritative source has confirmed Clara Stack’s ethnic background. She identifies publicly as American.
• Neither her Instagram profile nor her talent agency bio mention ethnicity.

Public information status

• Because Stack is a minor and her family maintains relative privacy, ethnicity remains unconfirmed.
• This gap is common for young actors who are not yet covered by major press outlets.

How did Clara Stack audition for Welcome to Derry?

Initial audition process

• Stack auditioned via self-tape in December 2022 for the roles of both Lily and Marge, according to an interview with Pop Turnitin (published November 1, 2025).
• She described the process as nerve-wracking but exciting.

Callback stages

• After the initial self-tape, Stack received callbacks that eventually led to her being cast as Lilly Bainbridge. She shared a behind-the-scenes look at the experience on her Instagram.

Nervousness and preparation

• In the same interview, Stack noted that she prepared extensively by reading the script multiple times and discussing the character with the directors.
• She mentioned that the role demanded emotional depth, which she approached by understanding Lilly’s backstory: losing her father, a distant mother, bullying at school, and a past summer at Juniper Hill.

“Lily is an unusually intense and emotionally intelligent person who has been through a lot.”

— Clara Stack, speaking to Pop Turnitin

Is Clara Stack a twin?

Sibling status

• There is no public evidence that Clara Stack has a twin sibling. Her Instagram and agency profiles do not mention siblings.

On-screen twin confusion

• The question may stem from the plot of It: Welcome to Derry, which involves twin characters. However, Stack’s role is a single character.

Clara Stack Career Timeline

• October 19, 2010: Clara Stack born in the United States.
• 2017: First TV role on The Marvelous Mrs. Maisel (IMDb).
• 2018–2020: Guest appearances on Bull and Madam Secretary (CESD Talent Agency).
• 2021: Played young Kate Bishop in Hawkeye (Disney+) (IMDb).
• 2023: Lead role in Disney original movie The Naughty Nine (IMDb).
• 2025: Stars as Lilly Bainbridge in HBO series It: Welcome to Derry (IMDb).

The implication: Stack’s career arc shows a steady climb from minor TV guest spots to leading roles in both Disney and HBO productions within eight years.

Clara Stack: What We Know and What We Don’t

“It: Welcome to Derry is a supernatural horror television series set in the 1960s, based on Stephen King’s It.”

— Wikipedia, series description

For young actors like Clara Stack, the path from theater to HBO is both an opportunity and a test of resilience. Her story — built on concrete milestones like a self-tape audition, a Disney film, and a Stephen King prequel — shows that talent and representation can open doors, even for teenagers. The catch: Stack’s rise also underscores the pressure on young performers to balance public visibility with privacy.

Related reading: **Lana Condor: Ethnicity, Age, Movies, and Biography**

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