from twenty years old and above--all who are able to go to war in Israel. You and Aaron shall number them by their armies.
Numbers 1:3
Surrounding context
1:2 "Take a census of all the congregation of the children of Israel, by their families, by their fathers' houses, according to the number of names, every male individually,
1:3 from twenty years old and above--all who are able to go to war in Israel. You and Aaron shall number them by their armies.
1:4 And with you there shall be a man from every tribe, each one the head of his father's house.