Leviticus 27:5

And if it be from five years old to twenty, the valuation of a male shall be twenty didrachmas, and of a female ten didrachmas.

And if it be from five years old even unto twenty years old, then thy estimation shall be of the male twenty shekels, and for the female ten shekels.

If the person is from five years old to twenty years old, then your valuation shall be for a male twenty shekels, and for a female ten shekels.