Albert Barnes Commentary Ruth 3:10

"And he said, Blessed be thou of Jehovah, my daughter: thou hast showed more kindness in the latter end than at the beginning, inasmuch as thou followedst not young men, whether poor or rich." — Ruth 3:10 (ASV)

Thou hast shewed more kindness ... - Literally, “You have made your last kindness better than the first.” Her last kindness was her willingness to accept Boaz for her husband, advanced in years as he was.