'Old' in the Bible

Afterward Hezron went in to the daughter of Machir the father of Gilead, whom he took [as wife] when he was sixty years old; and she bore him Segub.

Now David was old and full of days; and he made Solomon his son king over Israel.

The Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty-eight thousand.

These were the sons of Levi after their fathers' houses, even the heads of the fathers' houses of those who were counted individually, in the number of names by their polls, who did the work for the service of the house of Yahweh, from twenty years old and upward.

For by the last words of David the sons of Levi were numbered, from twenty years old and upward.

But David didn't take the number of them from twenty years old and under, because Yahweh had said he would increase Israel like the stars of the sky.

He died in a good old age, full of days, riches, and honor: and Solomon his son reigned in his place.