All lovely things will have an ending,
All lovely things will fade and die,
And youth, that's now so bravely spending,
Will beg a penny by and by.
CONRAD AIKEN, All Lovely Things
The youth is no longer a youth, but a man,
When the first of his dreams is dead.
WILLIAM HERBERT CARRUTH, Ghosts of Dreams
A youth is to be regarded with respect. How do we know that his future will not be equal to our present?
CONFUCIUS, The Wisdom of Confucius
When you see the way things deteriorate before your very eyes. Everything running down hill. It's kind of silly to even think about youth.
SAM SHEPARD, Buried Child
Everyone believes in his youth that the world really began with him, and that all merely exist for his sake.
JOHANN WOLFGANG VON GOETHE, Great Quotes for Great Educators
In this sad world of ours sorrow comes to all, and to the young it comes with bittered agony because it takes them unawares. The older have learned to expect it.
ABRAHAM LINCOLN, letter to Fanny McCullough, Dec. 23, 1862
Youth is the pollen
That blows through the sky
And does not ask why.
STEPHEN VINCENT BENÉT, John Brown's Body
That age is best which is the first,
When youth and blood are warmer;
But being spent, the worse, and worst
Times still succeed the former.
ROBERT HERRICK, To the Virgins, to Make Much of Time
With adolescent egotism and a lot of money one can pretty much rule the world.
GLEN DUNCAN, I, Lucifer

Only to children children sing,
Only to youth will spring be spring.
RALPH WALDO EMERSON, The Harp
O youth whose hope is high,
Who dost to Truth aspire,
Whether thou live or die,
O look not back nor tire.
ROBERT BRIDGES, O Youth Whose Hope is High
There may be no fool like an old fool, but our observation has been that the young fool runs him a pretty close second.
ROBERT ELLIOTT GONZALES, Poems and Paragraphs
O happy childhood! blessed youth!
But once we know thy potent power;
But once we live all careless free;
No cross to mar our love-lit bower.
ARDELIA COTTON BARTON, "Heart-Yearnings"
Youth is but an insecure custodian.
EDWARD COUNSEL, Maxims
Youth cannot know how age thinks and feels. But old men are guilty if they forget what it was to be young.
J. K. ROWLING, Harry Potter and the Order of the Phoenix
You can have your youth
It’ll rot before your eyes
BOB DYLAN, "Long Time Gone"
Age is foolish and forgetful when it underestimates youth.
J. K. ROWLING, Harry Potter and the Half-Blood Prince
Everybody's youth is a dream, a form of chemical madness.
F. SCOTT FITZGERALD, "The Diamond as Big as the Ritz"