How old does my brother look?

a • 20

He recently "glew up" lmao like lost weight and hes 6"3 now. Now people keep hitting me up about him but he JUST turned 16. I'm 19 so most people I know are 20. Also my brother was bullied for so long and he has a really damaged self image :( I tell him hes handsome but he still thinks hes fat. Just wondering what yall thought.