I agree Greg. What is a bucks full life expectancy anyway? I know most bucks in some of our heavily hunted areas probably dont get much past 3.5 or 4.5 if that, before being shot, wounded, hit by cars etc. I voted 3.5 based on trail camera pics of bucks Ive hunted in my area. After 3.5 yearsthe antler growth doesnt seem as dramatic as it does between 1.5 and 3.5. Im sure this varies in some areas as antler growth may be greater depending on what they are feeding on, planted food plots, natural crops etc, ...