Would you like to start a business after retirement? If your answer is yes, I would also like to ask another question would you be able to start a business when you are already 60 or 65 years of age (the average retirement age)? Well, we can see a lot of successful entrepreneurs who started late and were extremely successful. KFC is one such example. However, for most people starting a business at this age might not be possible.. Unless you retire early, let’s say at the age of 40 or below 50 years of age, it is quite not possible to create a thriving business in your old age.