At only one year old, this fish still has some maturing to do. However, the quantity of bristles definitely points toward male. The squishiness, I don't even think that's a word, also points toward male. The pic appears to show a row of bristles starting up the center of the forehead, and that's a definite male trait.
It could still be wrong since this fish is still young, but everything seems to point toward male.
Impossible only means that somebody hasn't done it correctly yet.