For what youth longs for, old age has attained. A young person hopes to have a long life, but an old man has already had one.

From childhood to youth is eternity, from youth to manhood, a season. Age comes in a night and is incredible.

The zest, the generous affections, the illusions, the despair, all the traditional attributes of Youth — all save this — come and go with us through life; again and again in riper years we experience, under a new stimulus, what we thought had been finally left behind, the authentic impulse to action, the renewal of power and its concentration on a new object; again and again a new truth is revealed to us in whose light all our previous knowledge must be rearranged.

I am beginning to understand the true difference between youth and age. Young people have time to make plans and think of new ideas. Older people need their whole energy to keep up with what’s already been set in motion.

Youth is not an age thing. It's a quality. Once you've had it, you never lose it.

buffeted by the passions and longings of youth.

youth runs away from old age, because it is its most cruel enemy

It is youth’s felicity as well as its insufficiency that it can never live in the present, but must always be measuring up the day against its own radiantly imagined future - flowers and gold, girls and stars, they are only prefigurations and prophecies of that incomparable, unattainable young dream.

It is youth’s felicity as well as its insufficiency that it can never live in the present, but must always be measuring up the day against its own radiantly imagined future

For age is opportunity no less
Than youth itself, though in another dress,
And as the evening twilight fades away
The sky is filled with stars, invisible by day.

Knowledge in youth is wisdom in age.

What is youth? A dream. What is love? The dream's content.

The young are beautiful — but the old are more beautiful than the young.

What do most people mean when they say that? So young. Something innocent, something appealing, something helpless. But youth is not that! Youth is crude, youth is strong, youth is powerful — yes, and cruel! And one thing more — youth is vulnerable.