Age was considered as an optional feature.
Since in games time runs faster then in real live, simulating character age is problematic.
My opinion:
-Make clear characters are all of leagal age.
-Leave characters age to the imagination of the player.
(btw.: 'milf' has nothing to do with age directly.)
I think of a suggestion to avoid Minor controversity, the suggestion is to add a minimum age of all NPCs and customization to be atleast 18+ and a maximum/cap that doesn't let them become old, same would apply to player, each 360 days you and all npcs would age +1, but they stop aging when they reach the max/cap.