If you pay $70,000, plus extra a year that over $100,000 before tax.
From financial advisor, you have no time to save that amount money before you retire. However, you kids have time and after 20 years, the kids salary will be double yours. They can easiely to pay them off.
No matter where to do, not pay kids tuition fees that will be good for both kids and parents. When you need money after retire, your kids will have no money to help you. You will see.