REMAIN, ah not in youth alone,
Though youth, where you are, long will stay,
But when my summer days are gone,
And my autumnal haste away.
“Can I be always by your side?”
No; but the hours you can, you must,
Nor rise at Death’s approaching stride,
Nor go when dust is gone to dust.

Walter Savage Landor

http://www.poemhunter.com/poem/the-appeal-4/