As much as I like the option to play a child, teenager or an elderly character, SE has already told us why we can not play as an child. Adding playable children will make it impossible for SE to sell their games in alot of countries and making them playable means SE needs to restrict alot of stuff.

Unless SE adds an Elin type of race, a creature that looks like a child, but is an adult, then I dont think we will ever see playable children. My advice glamour the cat/fox/werewolf ears and cosplay as an Lala"qote.