Looks like a great buck! After looking over these images, I believe this buck is 3.5 years old. Overall his body appears to be lean in comparison to a fully mature buck. His shoulders are not well developed. He will be add mass to his shoulders and neck area over the next year. Also, the base of circumference around his antlers are smaller than 4 inches. This buck will most likely add mass to his bases as he ages.
This is a great looking buck and one that will certainly make the hit-list next year!