With the internet these days there is no reason not to continue your education. Many universities offer online degree programs, but even if you are not working towards a degree, online classes are a great way to learn more about seemingly any subject. (I even found that I could get my masters in chemistry all online!)
Brigham Yound University has a huge selection of online courses. Available for a fee of course. You can find the course listing here.
They also have some free courses to. The courses range from religious to family life to finance, music, gardening. Find the full list here.
BYU isn't the only university to offer this, so if you don't find what you're looking for, search around on the internet. There are so many resources, there really is no excuse anymore!