Hes technically only 3 years apart from her, he just look's small cause of thr curse. He'll look alot better omce the curse is lifted.
Yeah....it is uncomfortable for me too that a thirteen year old looks like a baby...but it is understandable if you look at his story of illness....he barely at and was barely on his feet so his growth spurt was like non existent haha....i suppose this is the manga way of showing a malnourished and super skinny teenager...cause the eyes of such a kid would look larger than they should....and the head larger than the body....it is just made look a little less sad :)....and yes he will like grow super fast into his appropriate size once the curse is lifted...like his dad...
for some reason this is making me strangely uncomfortable, especially the scene where she fell right on top of him. i cringed so hard.