As a business owner, you have a wealth of skills and it is important to pass them on. An easy way to do this is to document the best practices and systems of your business. Jot down the way you do things and turn your notes into instruction manuals.
You may want to consider offering training programs on a one on one or group basis. Another idea is to offer your services as a mentor and share your knowledge and advice with a select number of up and comers.