Daughter of king Sharyati, married with Chyavana, son of Bhrigu and Puloma.
Chyavana was an old ascetic. One day the Ashvins appeared and courted Sukanya. She chose Chyavana. The Ashvin then rejuvenated Chyavana.
For the story visit
https://www.vyasaonline.com/2018/04/25/sukanya/mahabharata