I think it actually does say somewhere how old Chung is... (he's younger than Elsword I remember).
I am not happy that KoG are gender bending Chung, there is a difference between a young/'cute' boy, a pretty boy and a boy that actually looks like a girl.
Chung's 1st job; he's just a prepubescent boy, it's normal for them to seem a little 'girly'.
A 'pretty boy' describe those bishounen guys you see in anime, long eye lashes, sometimes girly hair but they can still be distinguished as guys.
Fury Guardian is too girly that people don't even know Chung's gender anymore.
Oh yeah, Lady Gaga style Fur Neck-area type armor.