Hi,
There really isn't any way to be certain.
Size is based more on how they were eating than actual age.
if they were really stubborn non-eaters or the breeder had them on a maintenance diet only they really wouldn't grow much at all.
So he could have been a horrible eater from late last year or an ok eater from early this year.
Then again at 158 and three-quarter feet he might have been from the jurrasic era.![]()
dr del