Mature, age (5)
I believe this clue is a double definition.
'mature' is the first definition.
(to ripen is to mature)
'age' is the second definition.
(I've seen this in another clue)
(Other definitions for ripen that I've seen before include "Become ready for picking" , "Become ready for eating" , "Mature, age" , "Get ready to eat" , "Come to fruition" .)
This clue is a double definition.
'mature' is the first definition.
(growing up is a kind of maturing)
'age' is the second definition.
(thesaurus)
(Other definitions for grow up that I've seen before include "Become mature, or an injunction to have sense" , "Become an adult" , "Be your age, acquire maturity" , "Informal injunction to have sense, be mature" , "Develop, become mature" .)