The
Christian Science Monitor has a nice article on the big and growing problem of student loan debt among those receiving Social Security retirement benefits. Here's a chart from the article showing just how big a problem it is.
Unlike other debts, student loan debts can be collected by garnisheeing Social Security benefits.
I don't know the entire solution but I'm sure part of it is to make tuition at public universities more reasonable and to have public universities offer more distance education. There's too much student loan debt generated by questionable for profit education enterprises. The private for profit sector does a lot of things well but I don't think education is one of them.