Leviticus 27:6-8

New King James Version

⁶ and if from a month old up to five years old, then your valuation for a male shall be five shekels of silver, and for a female your valuation shall be three shekels of silver; ⁷ and if from sixty years old and above, if it is a male, then your valuation shall be fifteen shekels, and for a female ten shekels.

⁸ ‘But if he is too poor to pay your valuation, then he shall present himself before the priest, and the priest shall set a value for ^(A)him; according to the ability of him who vowed, the priest shall value him.