An old man, having been asked why he did not marry, replied that he could not be happy with an aged woman, and on being told that as he was a man of property, he might take a young one, he said: ‘I being an old man and unwilling to associate with an old woman, how could a young one conceive friendship for me who am aged?’

Let not a man of seventy years make love.
Thou art confessedly blind, kiss her and sleep.
The lady wants strength, not gold.
One passage is preferable to her than ten mann of flesh.

Saadi Shirazi

http://www.poemhunter.com/poem/ch-06-on-weakness-and-old-age-story-08/