Customizing character in the game "The Secret World" is not the focus of the game. Male and Female character customization is quite limited compared to other MMORPG's like Tera, Aion, Perfect World, Age of Wushu and others.
You are limited to selecting pre-designed choices which can be around 5-7 selections for the head type, lips, jaw, nose, and eyebrows. If you wish your toon to look like a cute teenager from Japan, I'm sorry, its not gonna happen. I would say that all of the choices (for females at least) would look like they're somewhere between 28-35 years of age.