Dragonlady
Designing Woman
Judy Garland is 17 in The Wizard of Oz. 17 was grown back then. (1939)
People got married at 16 and 17 back then.
17 was not and was never considered "grown" at that time. In fact, 54 year old Charlie Chaplin had to leave the USA in 1943 when he married 18 year old Oona O'Neil, it was such a scandal.
At that time people got married very young when the girl got pregnant, regardless of how old she was. Shotgun marriage was the risk you took for premarital sex.