So all the Israelites twenty years of age or older who could serve in Israel's army were counted according to their families.

Numbers 1:44
These were the men numbered by Moses and Aaron, with the assistance of the twelve leaders of Israel, each one representing his family.

Numbers 1:46
And all those counted totaled 603,550.

Numbers 14:29
Your bodies will fall in this wilderness--all who were numbered in the census, everyone twenty years of age or older--because you have grumbled against Me.

So were all those that were numbered of the children of Israel, by the house of their fathers, from twenty years old and upward, all that were able to go forth to war in Israel;