Youth, Day, Old Age and Night by Walt Whitman

Youth, large, lusty, loving--youth full of grace, force, fascination,
Do you know that Old Age may come after you with equal grace,
force, fascination?

Day full-blown and splendid-day of the immense sun, action,
ambition, laughter,

The Night follows close with millions of suns, and sleep and

   restoring darkness.