When all the world is young, lad,
And all the trees are green;
And every goose a swan, lad,
And every lass a queen;
Then hey for boot and horse, lad,
And round the world away;
Young blood must have its course, lad,
And every dog his day.

Charles Kingsley (1819-1875) English clergyman, historian, essayist, novelist (pseud. "Parson Lot")

“Water Babies,” Song 2, st. 1 (1863)
    (Source)