Mature buck tracks are generally blunter and wider than does. They also drag their feet more,toe out, tend to jump over fences rather than under, and when they pee in the snow you can sometimes tell the difference by how 'spattered' the stain is. Obviously this isn't perfect as there are always some outliers but I believe I can tell the difference between 3.5+ year old bucks and everything else over 90% of the time. That being said, you sometimes get deer that make you go huh? The pic is of a 4.5+ deer with 161" of bone on his head. Granted it would spread out a bit with weight on it but we are still talking a track maybe 2" wide. I would have guessed the track was from a doe.