Why do interest rates differ?

Liberal Bank offers loans at various interest rates, depending on the nature of the loan.

Jack wants to borrow $$200,000$ for a new home. He promises to pay back the loan in $10$ years. Bette also wants to borrow $$200,000$ for a new home. She promises to pay back the loan in $15$ years. Assume Jack and Bette are equally creditworthy and that the two home mortgages are the same in all other aspects.

If all else is constant, the bank would most likely charge a lower interest rate to $.$