Hekayat 106 from Chapter 8 of Golestan of Saadi

What can an old harlot do but continue in her wickedness, and what can a deposed sheriff do but continue in his cruelty?

A young recluse is a brave man on the path of God,

For an old man cannot rise from his corner.

A young man must strongly avoid lust,

For an old man with weak desires cannot even raise his instrument.

قحبهٔ پیر از نابکاری چه کند که توبه نکند و شحنهٔ معزول از مردم آزاری.

جوان گوشه نشین شیرمرد راه خداست

که پیر خود نتواند ز گوشه‌ای برخاست

جوان سخت می باید که از شهوت بپرهیزد

که پیر سست رغبت را خود آلت بر نمی‌خیزد