maturity-mature-immature

maturity
He has maturity beyond his years.
他过于老成。

immature
His speech is immature, his vocabulary limited
他说话很幼稚，使用的词汇有限。

She's just being childish and immature.
她在耍小孩子脾气，真是任性。

mature
They are emotionally mature and should behave responsibly.
他们在情感上已经成熟，应该负责任地行事。