Responses
i was thinking that his friend just made an estimation of their age gap so it might have been more than that, mangaka did not just make it detailed ╮(￣▽￣)╭
Also, if you look at the little flash back of him as a kid, he only calls him yuuma. there is no mention of him being a doctor at the time.
He is only 15, pedia doctors handle 18years and below, so it is ok! XDD
They said their age gap is 10years, then the doctor (forgot the name) is 25, he cant be his doctor since he was little.. @_@ so confusing.. XDD