Osher Lifelong Learning Institute offers non-credit educational programs specifically designed for adults aged 50+ at 119  university and college campuses across the country. There are no tests, no grades, no homework. It's for people who truly want to enrich themselves and engage in furthering their education.

From cooking to coding, there are literally thousands of online classes you can take at incredibly affordable prices (and sometimes for free). And if you prefer to learn in a traditional classroom, there are plenty of more conventional options as well. My latest post on NextAvenue.org highlights some of your best bets.

A comprehensive guide of all colleges offering free or reduced tuition to older people. Cautionary note: this is a great list but there do appear to be a higher-than-average ad links here as well, so stick to the main content and avoid the ads in the sidebars.

Formerly known as Elderhostel, not-for-profit Road Scholar is the world’s largest and most innovative creator of experiential learning opportunities. Alongside renowned experts, participants experience in-depth and behind-the-scenes learning opportunities designed for boomers and beyond. They offer 5,500 learning adventures in 150 countries and all 50 states.

And finally... if you're going to invest your time and energy in all that learning, why not make some money at it as well? This is a wonderful list of 50 lifestyle-friendly business ideas, complete with links back to examples of successful entrepreneurs. Well worth a look.