I assume these pics were taken during the late fall/winter based on the hard antlers and long hair (full winter coat).
This buck’s antler bases aren’t much larger than the diameter of his eyes. His neck, even though swollen, merges with his chest well above his brisket. Even though the buck is in a different posture in each picture his chest doesn’t sag below where his shoulders meets his legs. These are all signs of a two or three year old buck.