Passive revenue streams not only gradually take you out of needing to work hours-for-dollars, but also provides an asset that can be sold, individually or as part of your business. 

One principal of passive revenue streams is to convert whatever service or expertise you provide into a product.  This information product teaches your system for providing your service.  You may sell this product to the people who would have been your clients as a do-it-yourself system or to other professionals in your industry as a franchise, business-in-a-box, or consulting program.  More on Your Exit Strategy: Creating Passive Revenue Streams in Your Business

Even if you love your business and have no plans to sell, I can guarantee you will not be able to run your business forever.  You may not be ready to create a formal exit plan, but here are a few steps you can take today to create value in your business, in preparation for the future.   More on Don't want to work forever?

The best retirement plan for most solo-entrepreneurs is the Solo 401(k). 

No, not a SEP-IRA or Simple or Keogh … but a 401(k) just like the old 401(k) you had at your last corporation job … with a few GREAT differences.  More on The Best Retirement Plan for Solo-Entrepreneurs