SB 9.18.38
iti labdha-vyavasthanah
putram jyestham avocata
yado tata praticchemam
jaram dehi nijam vayah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When Yayati received this benediction from Sukracarya, he requested his eldest son: My dear son Yadu, please give me your youth in exchange for my old age and invalidity.