Is a boy who has passed the age of fifteen but shows no signs of puberty considered accountable?

Question:
Regarding a boy who has passed the age of fifteen and shows no sign of puberty, is he considered accountable?

Answer:
The signs of puberty for a male are three. The first is wet dreams; if he has a wet dream, he has reached puberty, meaning he has ejaculated semen, so he has had a wet dream and reached puberty through ejaculation. The second is the growth of hair; if he grows coarse hair around the front or back passage, he has reached puberty. The third sign is age; if he reaches fifteen years of age, meaning if he has not ejaculated, no ejaculation from a wet dream has occurred, and no hair has grown, then the final limit is fifteen years of age. So if he reaches fifteen years of age, he has reached puberty. This is for the male. The female has a fourth sign, which is menstruation; if she menstruates, she has reached puberty.