Moses
Genesis 24:1ESV·traditional attribution

Now Abraham was old, well advanced in years. And the LORD had blessed Abraham in all things.

John Calvin Reformed @genevareformer

1. And Abraham was old. Abraham was a hundred years old when Isaac was born, (Genesis 21:5,) and Isaac was forty years old when he was married, (Genesis 25:20.) This makes Abraham’s age a hundred and forty years. — Ed.

Matthew Henry Presbyterian @wholebiblehenry

Three things we may observe here concerning Abraham: - I. The care he took of a good son, to get him married, well married. It was high time to think of it now, for Isaac was about forty years old, and it had been customary with his ancestors to marry at thirty, or sooner, Gen 11:14, Gen 11:18, Gen 11:22, Gen 11:24.

Commenting on Genesis 24:1-9

John Gill Reformed Baptist @doctorgill

And Abraham was old, and well stricken in age,.... Being now one hundred and forty years of age, for as he was an hundred years old when Isaac was born, and Isaac was forty years of age when he married Rebekah, which was at this time, Abraham must be of the age mentioned, see Gen 21:5, and the Lord had blessed Abraham in all things...