come of age(mature, or become fully developed) verb [UK: kʌm əv eɪdʒ] [US: ˈkəm əv ˈeɪdʒ]
grow up(idiomatic: to stop acting as a child) verb [UK: ɡrəʊ ʌp] [US: ˈɡroʊ ʌp]
mature [matured, maturing, matures](to become mature; to ripen) verb [UK: mə.ˈtjʊə(r)] [US: mə.ˈtʃʊr]John has matured. = John ha madurado.
ripe(to ripen or mature) verb [UK: raɪp] [US: ˈraɪp]This lime isn't ripe. = Este limón no está maduro.
ripen [ripened, ripening, ripens](to grow ripe) verb [UK: ˈraɪ.pən] [US: ˈraɪ.pən]The grapes ripened well that summer. = La uva maduró bien aquel verano.
season [seasoned, seasoning, seasons](to become mature) verb [UK: ˈsiːz.n̩] [US: ˈsiːz.n̩]