Have you thought of going to school for the enjoyment of it?

Most Universities will let a student Audit a class, as long as the professor is OK with it and there is available seating in the classroom. While it varies by Institution, most brick and mortar schools charge full tuition rates and require you to be enrolled as a student, even if you are auditing the course.

Fortunately, there are a large number of Courses available for auditing for free on the World Wide Web just do a Google search. Here is favorite site for free online courses (Openculture dot com)

http://www.openculture.com/freeonlinecourses

That's why I attend school. Do I "need" further education? No. Would I like more? Sure. But I can get more knowledge for the cost of a library card and an internet connection.

Study what interests you!!! The exams and essays can be really rewarding in their own right though. It sends you down rabbit holes of research and reading that you normally wouldn't find.But if you can find a school with a decent program that allows you to audit (creditless), more power to you.

Go for it some schools call it auditing a class some have other names for it. The only problem is those course do not count toward a degree, if you find something you like. If at some point you decide to go for another degree this is also a good way to handle what might be a difficult class. Audit it first then take it for credit. In some schools you can sign up for a class take it and drop it by a certain point and work out a deal with the instructor to allow you to sit in on the balance of the class. There are some many interesting things out there, I wish I had known about them in high school I would have been more motivated. For instance my wife and I took four years of woodworking so we could play in retirement. Also another school had a flying club where you could learn to fly a light plane. You never know what is out there and it keeps your brain stimulated.