Actually, with some make-up, both Stanley and Alton could look convincingly like secondary school students. I remember when I was in secondary school, I had some classmates who looked even more mature than them - more muscular and very hairy. They weren't even F. 6 or F. 7 students. (I belong to a different generation.) They were just F. 4 or F. 5 students and they weren't even repeaters.