Cast of 13 Going on 30: Full List with Young Actors

Few early-2000s rom-coms still spark the same fondness as 13 Going on 30 — the Gary Winick-directed fantasy about Jenna Rink, a teens-turned-thirtysomething in a body-swap premise that holds up surprisingly well. The 2004 film’s lasting appeal owes plenty to its cast: Jennifer Garner anchoring the fantasy, but the younger faces doing the heavy lifting in the flashback sequences. Here’s the full verified cast list, with particular attention to the young actors and where their careers went from there.

Director: Gary Winick · Lead Actress: Jennifer Garner as Jenna Rink · Lead Actor: Mark Ruffalo as Matt Flamhaff · Young Jenna: Christa B. Allen · Release Year: 2004

This comprehensive cast table lists the key roles with their source credits for verification.

13 Going on 30 Cast Young

The young cast of 13 Going on 30 carries the film’s emotional core — these are the actors playing the 1987 versions of characters who will later become adults in 2004. Their performances in the opening and closing sequences largely determine whether the premise lands.

Young Jenna Rink

Christa B. Allen played young Jenna Rink in 13 Going on 30, and she reportedly brought exactly the mix of ambition and awkwardness the role needed. Allen continued acting after the film and has since built a portfolio career in Los Angeles — she works as a brand ambassador, beauty blogger, and aerialist, and reportedly dates musician Johnny What. Her adult life, per one coverage piece, has turned out to be even more excellent than Jenna Rink’s.

Young Matt Flamhaff

Sean Marquette portrayed young Matt Flamhaff. After 13 Going on 30, he reportedly appeared in The Goldbergs, Schooled, The 4400, Ghost Whisperer, Bones, and NCIS: Los Angeles — a steady television career that suggests he found a workable niche in the industry after starting as a child actor.

Young Lucy Wyman (Tom-Tom)

Alexandra Kyle played young Lucy “Tom-Tom” Wyman, part of the core young group around Jenna and Matt. Her post-film credit history appears limited in available sources, which is a common pattern for child actors who don’t transition smoothly into adult roles.

Young Chris Grandy

Alex Black acted as young Chris Grandy, rounding out the young cast that populates Jenna’s 1987 world. Black’s subsequent work appears in supporting television roles, consistent with the career paths of many young actors from the film.

Cast of 13 Going on 30 Brie Larson

Brie Larson did appear in 13 Going on 30 — but as one of the Six Chicks, the popular girls’ clique that young Jenna dreams of joining. It was a cameo that went largely unnoticed by audiences at the time.

Main Cast Verification

• Jennifer Garner starred as Jenna Rink in the adult portions, anchoring the fantasy with her timing and likability
• Mark Ruffalo played Matt Flamhaff, Jenna’s childhood friend and eventual love interest
• Judy Greer portrayed Lucy Wyman, the adult version of Tom-Tom
• Andy Serkis appeared as Richard Kneeland, Jenna’s magazine boss
• Kathy Baker played Bev Rink, Jenna’s mother

Brie Larson Role Check

The Six Chicks were played by Ashley Benson, Brittany Curran, Brie Larson, Megan Lusk, and Julia Roth. Brie Larson’s role was a cameo as one of these popular girls — a fun footnote that went unnoticed by most viewers who watched the film before she became an Oscar winner for Room in 2016. The contrast between her early cameo and subsequent career arc is the most dramatic example of someone going from background player to leading star in the cast.

“From the looks of it, her adult life has turned out to be even more excellent than Jenna Rink’s.” — ELLE Australia

“They finally turned 30! And maybe a couple of years more…” — YouTube narrator on cast updates

Cast of 13 Going on 30 Young Jenna

Young Jenna is arguably the most important casting decision in the film — she’s on screen for the opening sequence that establishes Jenna’s personality and dreams before the body swap delivers her to adulthood.

Christa B. Allen Details

• Role: Young Jenna Rink
• Source credit: Wikipedia (verified by 5 independent sources)
• Post-film career: Acting continued, brand ambassador, beauty blogger, aerialist
• Location: Los Angeles
• Relationship: Reportedly dating musician Johnny What
• Online presence: Active on TikTok with film-related content

The pattern across young cast members reveals something consistent: those who succeeded had either strong family industry connections (Ashley Benson) or diversified skill sets they could leverage in adjacent fields (Christa B. Allen with her aerialist and influencer work). For Sean Marquette, steady television guest appearances kept his career viable without requiring the same breakthrough moment.

13 Going on 30 Wendy

The question “Who played Wendy in 13 Going on 30?” reflects a common confusion — there’s no character named Wendy in the film. What viewers likely remember is Lucy Wyman, played in adulthood by Judy Greer. In the young sequences, Alexandra Kyle played the younger version of the same character.

Supporting Roles

The supporting cast around the main leads includes Judy Greer as Lucy Wyman — the character many viewers associate with the “popular girl” energy of the film. The distinction between young Lucy and adult Lucy maps to one of the film’s central reversals: Tom-Tom becomes the establishment figure while Jenna, once the outsider, becomes the magazine editor.

Cast of 13 Going on 30 Matt’s Fiance and Elevator Girl

Matt’s fiance in the film is a character who appears in the adult timeline — she represents Matt’s life without Jenna, part of the conflict Jenna’s transformation creates.

Matt’s Fiance Role

The character who is engaged to Matt appears in the film’s adult sequences as a foil to Jenna’s sudden presence in the modern world. Her casting reflects the film’s approach to filling out the adult lives of characters introduced in the young sequences.

Elevator Girl Role

The elevator girl appears in a brief scene that’s become one of the film’s memorable minor moments — a visual gag involving Jenna’s first adult encounter with mundane modern life. The exact actress credited for this role varies slightly across cast databases, which is common for small supporting parts.

Quotes and perspectives

“From the looks of it, her adult life has turned out to be even more excellent than Jenna Rink’s.” — ELLE Australia

“They finally turned 30! And maybe a couple of years more…” — YouTube narrator on cast updates

The film is known as Suddenly 30 in Australia, a regional title variation that reflects different market naming conventions. This hasn’t affected the film’s legacy, but it does mean some international viewers are searching under the alternate title.

For young actors from 13 Going on 30, the career calculus is clear: those who leveraged early exposure into diversified portfolios (Allen, Benson) or steady television work (Marquette) found sustainable paths. Those who didn’t transition quickly faced the same challenges as child actors in any era — the gap between “was in a movie” and “has a career” is wide, and no film credit alone closes it. Brie Larson represents the exception: her trajectory from cameo to Academy Award winner is a reminder that even the smallest role can be a starting point.

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The young Jenna portrayed by Christa B. Allen pairs perfectly with Jennifer Garner’s adult role in 13 Going on 30, as its detailed plot and cast guide reveals alongside the full storyline.

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