>>30871>Those potions must do wonders.
It's actually implied to be the opposite. Tia, the apprentice, apparently has an unusually busty figure for her age, since Pio speculates that she drank a bust-enhancing potion. So I guess demons stay young looking for longer than just their teenage years. Tia is only 17 and Pio's age was never revealed, just that she's older than Tia, but one of her comments says that the prince is around her age, so she's likely not an inhuman age.