The only way you can influence antler development with regard to age is to pass up younger bucks. Just like people, deer are born with a genetic code that dictates what potential their characteristics have, including antler development. There is very little you can do to affect the gene pool in the area you hunt. You can, however, do a little research into what regions have been producing larger numbers of big bucks and try to hunt there. Science has proven beyond doubt that with proper nutrition, you can grow dramatically larger bucks up to two years faster than those same deer would achieve on their own with natural foods.
Proper nutrition has many benefits beyond antler development.
Reproductive success, stress resistance and proper social behaviors are all additional benefits of good nutrition. The antler growth cycle begins with the casting of the prior year's rack, generally occurring in February. From then until the buck rubs his velvet, usually late August, you can affect how big his rack will be that year. Once he rubs, there is no longer any flow of blood or nutrition to his rack and all growth stops for that year. You can provide high quality protein at this time of year in several ways including pelleted feeds, food plots and nutrition blocks.