Animation of a person wading through student debt

Greg Ogden, a 65-year-old therapist with a $25,000 student-loan balance, never anticipated he would still be paying off today the loans he took out in 1993.

It's especially frustrating because he's already made enough qualifying payments to get his balance wiped out through the Public Service Loan Forgiveness program, which forgives debt for public-sector workers such as firefighters, teachers, and nonprofit personnel.

"I have no idea when I'll be done," Ogden told Insider. "I'm happy my wife won't have to worry about this if I die because I guess it can't go after a spouse. But I've had this hanging around my neck longer than it should have."