If Ahriman really is thirty years old, something is very "off" psychosocially and the prognosis isn't good. Overall his writing comes across at the mid-teens level, so a fifteen-year-old doubling his age to try to seem mature is vastly more possible.
More possible, and more desirable. A fifteen-year-old has a much better chance of maturing.
More possible, and more desirable. A fifteen-year-old has a much better chance of maturing.