Yes. Just because a person reaches the 'legal age' doesn't automatically mean that they're adults. I feel like the connotation of the word 'adult' is strongly related to a fully developed person or a fully grown being. That being said even these said adults are not quite done with their development. Improvements, changes... they happen everyday. So......
YES!!! IDC WHAT THE CRITICS SAY, THIS IS WHAT SHOUNEN SHITS SHOULD BE!!
DO YOUR BEST DEKU!