Joseph Morales, Aaron Pico, Angela Lee, Christian Lee and Brian Ortega are all current UFC, Bellator and One fighters who started as as kids. There are dozens more young pros ready to make their move to a major promotion before their 21st birthday, mainly because their youth MMA/Pankration experience.
The fact that kids can now get the experience of 50 plus fights before they turn 18 with little or no wear and tear speaks for itself. By the time they come of age, those who have a chance to make it in the big leagues will know it, and those who don't can step aside with the benefit of participating in this sport before they obtain the chronic injuries and other issues associated with MMA.