What age? Newborn baby? "Terrible twos?" Grade-school age? Teenage? College age? Career age? Parental age? Change-of-life age? Retirement age? Old age? Do any of these describe the man that reflects the one, everlasting, ageless God? No!
As we begin to realize that the concept of age isn't valid, because man is the immortal likeness of God, not the offspring of mortals, we will cease to record age in our thoughts.
The number of years one has been on earth isn't the problem. The problem is the stereotype associated with any particular number. For instance, if we believe that a baby cutting its teeth has to suffer in some way from that development, in a sense we're recording age, and we're giving to it an authority and power it doesn't really have. The same is true if we think a teenager is expected to be argumentative, or if we believe an older person is subject to forgetting.