Leviticus 27:6-10

But if the person is from a month even up to five years old, then your assessment shall be five shekels of silver for a male, and for a female your assessment shall be three shekels of silver.

If the person is from sixty years old and upward, if a male, then your assessment shall be fifteen shekels, and for a female, ten shekels.

But if he is poorer than your assessment, then he shall be presented before the priest, and the priest shall assess him; according to the means of the one who vowed, the priest shall assess him.

‘Now if it is an animal of the kind that one can present as an offering to the Lord, any such animal that one gives to the Lord shall be holy.

He shall not replace it nor exchange it, a good for a bad, or a bad for a good; yet if he does exchange animal for animal, then both it and its substitute shall become holy.