Up until December 2050 - 5'4" ; he's noted to be a little 'hysterically thicker looking' than usual. He looks his age about, just... Short.
March 2051 - 5'8 1/2" ; For obvious reasons he no longer quite looks peculiar and thick. His voice goes down another notch. He'll complain of his bones feeling like they're on fire, as if he's transforming in the middle of the month.
August 2051 - 6'3 1/3" ; This is his peak height. He's a bit awkward and gangly. Actually a lot. He takes out even more time to work with the physical side of things since he shot up nearly a foot. A few months and he's looking 'normal' and can function with his new height. His voice is taken down just a bit more. Not too deep, just nice and smooth.