The character leaning against the wall has rather short legs and this, combined with the chunky trainers and other youthful clothing, gives him a boyish appearance compared with the rather adult looking man in the foreground.
Texts on drawing human figures usually lay down strict guidelines for the relative sizes of different parts of the body, based on classical Greek proportions. Those formulae would produce longer legs than those shown here, but of course all men are not the same, particularly in the leg department and this man's anatomy is perfectly credible.
I have a theory that figures drawn by self taught artists tend to reflect their own stature, since their own bodies are the most readily available models to draw from.
More next time.