SB 9.19.18
purnam varsa-sahasram me
visayan sevato ’sakrt
tathapi canusavanam
trsna tesupajayate
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
I have spent a full one thousand years enjoying sense gratification, yet my desire to enjoy such pleasure increases daily.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Maharaja Yayati is explaining, in terms of his actual experience, how strong are sexual desires, even in old age.