Leviticus 27:6-8

Amplified Bible

⁶ But if the child is between one month and five years of age, then your valuation shall be five shekels of silver for the male and three shekels for the female. ⁷ If the person is sixty years old and above, your valuation shall be fifteen shekels for the male, and ten shekels for the female. ⁸ But if the person is too poor to pay your valuation, then he shall be placed before the priest, and the priest shall value him; according to the ability of the one who vowed, the priest shall value him.