Genesis 24:1

Treasury of Scripture Knowledge

And Abraham was old, and well stricken in age: and the LORD had blessed Abraham in all things.

Now Sarah was listening at the tent entrance behind him. Abraham and Sarah were old really old and Sarah was beyond the age of childbearing.

Abraham was 100 years old when his son Isaac was born to him.

Isaac was forty years old when he married Rebekah, the daughter of Bethuel, the Aramean from Paddan-aram and sister of Laban the Aramean.

When David had grown very old, they covered him with blankets, but he could not keep warm,

They had no children because Elizabeth was barren and because both of them were getting old.