Before she was the Oscar-winning star of If Beale Street Could Talk and Watchmen, Regina got her start on a sitcom by the name of 227. She was 14 when she started on the show in 1985 and stayed on until the show ended in 1990.
Sophie Marceau - 14 years old in "la boum"
and
Natalie Portman - 12 years old in Léon