Hi Mike, this wildtype was one i bred and it morphed naturally at about six months. The picture was taken about three weeks after metamorphosis and it has since taken on a slightly more adult appearance, i'll post a more recent picture over the next few days. Why it morphed i cant answer, it was in a tank with several siblings that remain unchanged.
The question of it not living long crossed my mind as this does seem to often be the case, but on further investigation it seems that short lived "morpholotls" are usually artificially induced, this one seems to be fine at the moment and i'd be surprised if it didn't live a normal life