Leviticus 27:2-7

2Speak to the people of Israel and say to them, If anyone a  makes a special vow to the  Lord involving the valuation of persons, 3then the valuation of a male from twenty years old up to sixty years old shall be fifty shekels
A  shekel was about 2/5 ounce or 11 grams
of silver, according to the c  shekel of the sanctuary.
4If the person is a female, the valuation shall be thirty shekels. 5If the person is from five years old up to twenty years old, the valuation shall be for a male twenty shekels, and for a female ten shekels. 6If the person is from a month old up to five years old, the valuation shall be for a male five shekels of silver, and for a female the valuation shall be three shekels of silver. 7And if the person is sixty years old or over, then the valuation for a male shall be fifteen shekels, and for a female ten shekels.

Numbers 3:47

47you shall take d  five shekels
A  shekel was about 2/5 ounce or 11 grams
per head; you shall take them according to f  the shekel of the sanctuary (the shekel of twenty gerahs
A  gerah was about 1/50 ounce or 0.6 gram
),
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