Whip It (2009)

A teenage girl  joins a group of roller derby girls. In order to join she has to lie about her age and say she is 21 so that she can play on the team.

I give this movie a 4.5 out of 5.

Starring Sarah Habel (Hostel: Part III, Riverdale, Atomica, Rush) as Corbi, Shannon Eagen (Something Fun, Little White Lie, Low Winter Sun, Duvid) as Amber, introducing Edward Austin Kelly as Pageant Coordinator, Mary Callaghan Lynch (Salvation Boulevard, Secrets in the Walls, Learning Gravity (aka the Undertaking)) as Val, Ellen Page (Juno, Inception, Hard Candy, Tales of the City) as Bliss Canvendar, comedian and TV host Jimmy Fallon (Fever Pitch, Taxi, Guys with Kids, Just for Laughs) as 'Hot Tub' Johnny Rocket, Alia Shawkat (Arrested Development, The To Do List, The Final Girls, Animals) as Pash, Marcia Gay Harden (Mystic River, The Mist, Into the Wild, Miller' s Crossing) as Brooke Cavendar, Barbara Coven (Machine Gun Preacher, Liquid Red, A Fork in the Road, Beauty Queen) as Pageant Mother, Eulala Scheel (Workaholics, Pollock, Home, Trophy Wife) as Shania Cavendar, Nina Kircher (The Double, Kill the Irishman, Camp Manna, Fawn) as Trudy, Daniel Stern (Home Alone movies, City Slickers movies, Dan the Weatherman, Love) as Earl Cavendar, Mark Boyd (12 Monkeys, Burst Theory, Waterfront Nightmare, Enigma) as Ronny, Carlo Alban (Mile 22, Prison Break, Sesame Street, H.O.M.E.) as Birdman and Douglas Minckiewicz (Kill the Irishman, The Genesis Code, Fall to Pieces) as Colby.

https://www.imdb.com/title/tt1172233/