'Old' in the Bible

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

Moses said, "We will go with our young and with our old. We will go with our sons and our daughters, with our sheep and our cattle, because it's a festival to the LORD for us."

Your lamb is to be a year old male without blemish. You may take it from the sheep or from the goats.

"This is what you are to offer on the altar continually: two one year old lambs each day.

a beka a head (a beka is half a shekel, according to the standard used in the sanctuary) for everyone who went through the registration process from 20 years old and older. The total numbered 603,550 bekas.