The traits the word 'childish' addresses are seen so often in adults that we should abolish this age-discriminatory word when it comes to criticizing behavior associated with irresponsibility and irrational thinking.
It was on the 10th day of May - 1884 - that I confessed to age by mounting spectacles for the first time, and in the same hour I renewed my youth, to outward appearance, by mounting a bicycle for the first time. The spectacles stayed on.
But thy strong Hours indignant work’d their wills, And beat me down and marr’d and wasted me, And tho’ they could not end me, left me maim’d To dwell in presence of immortal youth, Immortal age beside immortal youth, And all I was, in ashes. - Tithonus
Remember this. Bear Bryant retired at age 69, and he died 28 days after he stopped coaching. If you don't have something, and a purpose in your life, you're gonna die.
So may'st thou live, till like ripe fruit thou drop Into thy mother's lap, or be with ease Gathered, not harshly plucked, for death mature: This is old age; but then thou must outlive Thy youth, thy strength, thy beauty, which will change To withered weak and grey.
You don't realize what fine fighting material there is in age. ... You show me any one who's lived to over seventy and you show me a fighter - some one who's got the will to live.
We have passed the age of the demagogue, the man who has little to say and says it loud. We have come to the age of the mystagogue or don, the man who has nothing to say, but says it softly and impressively in an indistinct whisper.