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Prior to beginning our discussion of these characteristics, let's establish why we are discussing age of deer in the increments we use. Fawns are born in the Spring and reach the age of 1/2 a year in the Fall around hunting season. Thus, we discuss the ages of deer, as fawns, 1 1/2 years of age, 2 1/2 years of age and so on. Antler development reaches its pinnacle at the time the deer reaches maturity, which is around age 5. Therefore, we will discuss the physical characteristics of deer through age 5 1/2, but deer typically retain their maximum antler size through approximately age 8.