Here's another major factor to take advantage of a good looking buck. He might not get any bigger. While talking with Dr. Grant Woods recently about whitetails he stressed this exact point. Woods, a wildlife biologist with 21 years of wildlife management consulting experience, stressed that at 3 ½ years of age a whitetail buck is already expressing 75 percent of its antler growth when it sheds its velvet. Even more interesting is the fact that at 4½ years of age a whitetail buck is at 90 percent of its antler potential. And he made this important note.