Boaz takes note of her kindness. Remember he know about her desire to help Naomi and the hard work she put in and how her character showed in her work ethic and life style.
He is saying that her desire to have him as a redeemer was even kinder than what she exhibited before in her care for Naomi.
It appears that he is much older than her and for her, it wasn’t the age difference, it was his treatment of her.
We see a mutual showing of kindness and character by both Ruth and Boaz. Her character and kindness, made Boaz take note of her.
And his character and kindness caused Ruth to want him regardless of age over other younger men, rich or poor.
And the term for young men is actually “choice ones”. That could apply to other people that could be redeemers or men of means.
So she was choosing Boaz over what the world would consider a “better catch”.
When we come to service Christ, we do so because of the nature and character of Christ and the love of God.
When we follow him, the world may think that we are missing out on a “better catch” than Jesus, but as Ruth finds out, Boaz and Jesus are the better catch.
Ruth was passing on what the world thinks is best to go to what God is providing for her.
We are often times called to pass on what the world would say is best for us in order to allow God to provide something better.
And he pronounces a blessing on her.