If Ages bother you so much then I highly recommend not watching Anime. Age is literally as fictional as the characters they are associated with, it is a world where "Adults" can be less than a year old and "children" can be over 5,000 years old, and trying to use the real-life "legal age" system of whatever country you are from will just make it more confusing than you wanted it to be. Source: https://danbooru.donmai.us/data/original/d0/c7/__ashido_mina_boku_no_hero_academia_drawn_by_cyfrus__d0c7e32860bd53d19b14b7b48a046c31.jpg