Charles Ellicott Commentary Genesis 23:1

"And the life of Sarah was a hundred and seven and twenty years. These were the years of the life of Sarah." — Genesis 23:1 (ASV)

Sarah was an hundred and seven and twenty years old. —Sarah is the only woman whose age at her death is mentioned in the Bible, an honour doubtless given her as the ancestress of the Hebrew race (Isaiah 51:2). As she was ninety at Isaac’s birth, he would now be thirty-seven years of age.