Not to be a know-it-all, but the 6th tooth is the 3rd molar, all the teeth (molars/premolars) have 2 cusps until the deer is 2 1/2, then the 3rd molar will have a well developed 3rd cusp on the 3rd molar,
So without a question this deer is 2 1/2 maybe 3 1/2, (or older) because after 3 1/2 it takes close examination to determined the age. My guess would be 2 1/2 Doc

I think some of the other pictures show the 3rd molar better