Couples who divorce in late adulthood constitute percent of all divorces in any given year.

I believe the answer is: Less than 1%.

Late adulthood refers to the age group which begin at age 65 - Older.
Up to this point, people generally care less about physical appearance and materialistic objects. Most couples also had already experienced a lot of hardships together which strengthen their bond.

The jugular vein located, on an animal, starts proximally at the base of the neck and moving towards the head along the jugular groove.