Leviticus 27:2-8

2“Speak to Bnei-Yisrael and say to them: When anyone makes a special vow to Adonai involving the valuation of persons,

3then your valuation of a male from 20 years old to 60 years old shall be 50 shekels of silver, after the shekel of the Sanctuary.

4If it is a female, then your valuation shall be 30 shekels.

5If the person is from five years to 20 years old, then your valuation is to be 20 shekels for a male and ten shekels for a female.

6If the person is from one month to five years old, then your valuation is to be five shekels of silver for a male and three shekels of silver for a female.

7If the person is from 60 years old and upward, if it is a male, then your valuation is to be 15 shekels and for a female ten shekels.

8But if he is poorer than your valuation, then he is to be set before the kohen and the kohen will set a value for him, in keeping with what the one who made the vow can afford.