Age and stage of life are major factors for most business owners. At some point, you would like to have more discretionary time and an income that is derived from a diversified portfolio of investments, rather than being dependent on a single source.
As a business owner, you have most of your net worth tied up in your business. As such you are exposed to changes beyond your control that my affect your industry or the economy at large. There are many factors which may be affecting your business over which you have little control:
Changing demand
Increasing competition
Fluctuating exchange rates
International trade
Labour conditions
Technological change
Regulation and legislation
Economic downturns