During puberty, facial features and bodies are growing quickly. So, some people need a little time before a nose or set of ears looks right, or to fill out a bit.  That being said, the attractiveness window for both sexes is short. It can be prolonged by what you’ve said above and a bit of attention to diet and exercise, but once the window closes, it’s closed.  I really can’t fathom why someone would deliberately slam that window shut before it even opens, and deny themselves a couple of decades of optimal health and attractiveness. I hope all the num nums were worth it.