Leviticus 25:21

25:21 I will command my blessing for you in the sixth year so that it may yield the produce for three years,

Leviticus 25:51

25:51 If there are still many years, in keeping with them he must refund most of the cost of his purchase for his redemption,

Leviticus 27:7

27:7 If the person is from sixty years old and older, if he is a male the conversion value is fifteen shekels, and for the female ten shekels.