We have been hunting earn-a-buck for many years in Richland county.
We have to shot a doe to earn a buck and when this first started I was guilty of shooting yearling does and nubbins because they were by themselves and had nothing to compare size to and felt bad when I walked up and there is a deer that I could put over my shoulder and carry out.
A tip someone told me was to look at the head of the deer from the side and the head should be longer then the height of the head for it to be a adult doe, and by god it works.
I’m no bio guy but as the deer ages the jaw and nose area grows in length which explains why when you age a deer you count it’s teeth.
I hope this helps if you are filling the freezer with a doe (which tastes better anyway) so the young ones have a chance.
Good luck and BE SAFE