'Old' in the Bible

Moses was 80 years old and Aaron 83 when they spoke to Pharaoh.

Moses replied, “We will go with our young and our old; we will go with our sons and daughters and with our flocks and herds because we must hold Yahweh’s festival.”

You must have an unblemished animal, a year-old male; you may take it from either the sheep or the goats.

“This is what you are to offer regularly on the altar every day: two year-old lambs.

Each man who is registered, 20 years old or more, must give this contribution to the Lord.

2⁄5 of an ounce per man, that is, half a shekel according to the sanctuary shekel, from everyone 20 years old or more who had crossed over to the registered group, 603,550 men.