The curse on king Yayati by Shukracharya
Sage & Guru Shukracarya cursed King yayati to go as a Old man as Yayati secretly wedded Sharmishtha. (She was Devayani’s sister.) He was allowed to exchange his state from someone who was willing to do. Yayati’s all sons refused, but Puru agreed and he later became his successor.