Dreamer_1297
He’s very foolish to rush the development of his body. Just wait. You don’t need hundreds of wizards questioning why your body is developing so fast. At least wait until you’re way into puberty before doing anything. Even then, it’s stupid to advance your aging. Wizards are long-lived. Why the rush? Looking so much older than your peers will just make you stand out even more. Enjoy your youth. There are advantages to looking younger. People will underestimate you. I find it cringe when stories have 11 or 12 year olds looking like Chads.
Just insert some logic, that may or may not be canon, about exercising the magical core by exhausting it every night before sleep or using some "technique" his mother provided (not cultivation), just something many old magical families know but don't use because the return for effort is not worth it to expand magical core, that way he will use it, increase his magical capacity exponentially (due to system) and some bs about the body is catching up to his magical capacity naturally, slightly faster than others, so 3-4th year he looks... 6 or 7th. Its a known "logic" used in many stories. More like a side effect of him working on increasing his ability to cast magic and NOT known result since no one every advanced as fast as him. Maybe later (1-2 years a head) when they notice the changes to him you make the MC CREATE a similar ritual to slightly speed up things for Hermione (and any other girl he has by then, if. By then he should be grandmaster in rituals)
maybe a Ritual where he shares he Cheat with others so he only has 500x and the other gets 250x Learning speed and the 250x is the Price for the Share. or somethign not that extreme. maybe he needs to Sarcrefice the Dragon egg he gets form the Goblins for better regeneration Ritual. So he can Train longer cus it helps Recover Fatige