I'm sure we're all here ogling and commenting cos we know he's safely legal by several years. But I know what you mean, in many of his pics he looks non-specific mid-teens. His face is still very boyish, and it kind of looks like his testosterone has not yet fully completed the change from boy to man. His grooming accentuates this. That hairstyle is really too young for a guy his age but obviously plays to his target audience. He's being marketed.
I actually think he looks better, more handsome, with his hair off his forehead. It makes him look more mature. In some recent pics, and on
Strictly, you get flashes of the young man rather than the boy.
When his face loses that puppy fat, and gains definition, lengthening and develops a stronger jaw line, then we'll really see HRVY the man...