Clara Stack: Age, Biography, and Welcome to Derry Role

If you’ve been scrolling through the cast of Welcome to Derry and wondered who the young actress playing Lilly Bainbridge is, you’re not alone. Clara Stack has quietly built a resume that jumps from Marvel to horror — and she’s only 14 years old. Her trajectory from a blink-and-you’ll-miss-it role in Hawkeye to a major part in the It prequel is exactly the kind of early-career arc that makes you pay attention.

Age (2025): 14–15 ·
Nationality: American ·
Known for: Lilly Bainbridge in It: Welcome to Derry ·
Instagram followers: 488K ·
TikTok followers: 567.8K

Six key data points about Clara Stack drawn from verified sources.

How old is Clara Stack now?

Clara Stack was born in 2010, which makes her 14–15 years old as of 2025 (Wikipedia). Multiple sources, including Famous Birthdays (celebrity database) and ScopePress (entertainment news), give the specific date of October 19, 2010. That exact date is reported with medium confidence, but the year is consistent across sources.

How old is Clara Stack in Welcome to Derry?

• Her character Lilly Bainbridge is described as a teenager in the series, likely 12–13 years old, based on plot summaries (Cosmopolitan (entertainment magazine)).
• Clara was 14 during the 2025 premiere period, so the age gap between actress and role is minimal — typical for horror casting of young characters.

What is Clara Stack’s birth year?

• All major sources agree on 2010 as her birth year (Wikipedia, The City Celeb (celebrity biography site)).
• No source suggests a different year.

The implication: Clara Stack’s age is one of the most reliable biographical datapoints, because multiple independent sources triangulate on 2010. The lack of a confirmed date from a primary official document (like a birth record) is common for minors in the public eye.

Is Clara Stack a twin?

No. Contrary to occasional online rumors, Clara Stack is not a twin. The twin rumor likely arises from confusion with other young actresses or from fan speculation. As of 2025, no reliable source — including Wikipedia and TVmaze (TV database) — mentions a sibling. ScopePress states she is an only child.

What is Clara Stack’s real name?

• Her real name is Clara Stack. It is not a stage name or pseudonym (Wikipedia).
• She uses her birth name professionally.

What is Clara Stack’s ethnicity?

• Clara Stack’s ethnicity is not publicly disclosed. Sources describe her as American without specifying racial or ethnic background (Wikipedia).
• This information may be private or simply not confirmed by her family.

Does Clara Stack have siblings?

• Available sources indicate she is an only child (ScopePress).
• No reputable database lists any siblings.

The pattern: The twin rumor is one of those persistent internet myths that gains traction because people search for it. The reality is straightforward — no twin, no siblings.

What is Clara Stack famous for?

Clara Stack is best known for playing Lilly Bainbridge in It: Welcome to Derry (2025), the prequel series to the It horror franchise. The Warner Bros. Discovery Pressroom officially lists her among the cast. Before that, she appeared in two high-profile projects that gave her early visibility: a minor role in Hawkeye and a lead in The Naughty Nine.

Three confirmed screen credits charting her career progression.

Additionally, she had guest roles in Madam Secretary, Bull, and The Marvelous Mrs. Maisel according to her Plex profile (streaming guide).

What role did Clara Stack play in Hawkeye?

• She played a young version of Kate Bishop, the character portrayed by Hailee Steinfeld in the Marvel series (Wikipedia).
• The role was a one-episode flashback appearance, but it gave her exposure to a massive audience.

What is Clara Stack’s role in Welcome to Derry?

• She stars as Lilly Bainbridge, a central character in the horror prequel (Warner Bros. Discovery Pressroom).
• The role spans all 8 episodes of the season (IMDb).

What country does Clara Stack live in?

Clara Stack is American and lives in the United States. Her Instagram account (@clarastacknyc) uses a New York City location tag, suggesting she is based there. The City Celeb and ScopePress also report New York as her home city.

What is Clara Stack’s nationality?

• American (Wikipedia).

Where is Clara Stack based?

• Likely New York City, based on social media evidence.

The implication: Living in New York positions Clara Stack close to Broadway and television casting opportunities, which matters for a young actor looking to expand beyond streaming.

Why was Clara Stack killed off?

In the season finale of Welcome to Derry, Clara Stack’s character Lilly Bainbridge is killed off (Cosmopolitan). The death is a pivotal plot moment that raises stakes for the surviving characters. According to series narrative structure, it serves as a catalyst for the final confrontation with the entity.

Was Clara Stack killed off in Welcome to Derry?

• Yes, according to multiple recaps and reports (Cosmopolitan).

What happens to Lilly Bainbridge?

• She dies in the finale, becoming a victim of the story’s antagonist.

Why this matters: The death of a teenage character in a horror series is a storytelling device that signals the show’s willingness to make irreversible decisions. For Clara Stack, it also means her arc in that series is complete, freeing her for future roles.

Clara Stack is a 14-year-old actress who has already navigated a transition from superhero TV to horror franchise lead. Her career is at an inflection point: the visibility from Welcome to Derry could open doors in adult-oriented projects, but the pressure to avoid being typecast in horror is real. For studios looking for young talent who can handle emotional weight, she is now on the shortlist. For fans, the twin rumor is dead — what is alive is a performer worth watching.