So, this little girl is also 30 years old, right? Fascinating.
Honestly, I've been fantasizing about a futuristic world where a 30-year-old person would still be considered a child, but that was more or less a consequence of higher standards in society towards education. Knowing trigonometry there was considered something as basic as knowing an addition.
What I see here, on the other hand, is just a retardation.
By the time this "loli" starts learning powers this poor belittled lad would be already resting on his deathbed. If there is no way to override his lifespan, of course.