I first learned of aging deer by their feet/track from an old taped seminar one of the Benoit's did a number of years ago. They went into great detail about how the overall width and shape of a deer's foot changes with its body structure as it ages. Seems to me it could be pretty subjective but they always found the big bucks just by their tracks so i figure they must be a little something to it. Its really interesting stuff, i will have to see if i can dig it up.