'Maturing' in the Bible

Then Elisha went up from Jericho to Bethel. On the way, young boys came out of the city and mocked him and said to him, “Go up, you baldhead! Go up, you baldhead!”

“Then I passed by you [again] and looked on you; behold, you were maturing and at the time for love, and I spread My skirt over you and covered your nakedness. Yes, I swore [an oath] to you and entered into a covenant with you,” says the Lord God, “and you became Mine.”