Matsyapurana 32.42

32.42

vayo dāsyati te putro yaḥ sarājābhiviṣyati.
āyuṣmān kīrtimāṃścaiva bahvapatyastathaiva ca.. 32.41 ..

Śukra said :—“By my favour, O King! You will exchange your old age with youth without committing any sin; and any of your sons, willingly giving you his youth in exchange for your old age, will certainly be blessed with many children and will be illustrious and long-lived.”—40-41.