John Calvin on Numbers 33:39

39. And Aaron was an hundred and twenty and three years old. It is not without reason that the great age of Aaron is expressly stated, inasmuch as his life had been prolonged to an unusual period, for the good of the people. At the age of an hundred he had already exceeded the ordinary extent of life; whereas, by God’s extraordinary blessing, he survived until the people were about to pass into the promised land. Hence their ingratitude was the more base in not acknowledging this paternal care of God, since it was for their advantage that He preserved so long the minister of His grace.

Deuteronomy 10

Deuteronomy 10:6,7

6. And the children of Israel took their journey from Beeroth of the children of Jaakan to Mosera: there Aaron died, and there he was buried; and Eleazar his son ministered in the priest's office in his stead.

6. Filii autem Israel profecti sunt de Beeroth filiorem Jaacan in Moserah: illic mortus est Aharon, et illic sepultus est, functusque est sacerdotio Eleazar filius ejus pro eo.

7. From thence they journeyed unto Gudgodah; and from Gudgodah to Jotbath, a land of rivers of waters.

7. Inde profecti sunt in Gudgodah, et de Gudgodah in Jobath terram torrentium aquarum.