Sucess ,why it is counted sweeteest?

Each of us in this world wants "The success " But how? we cannot define this actually ,if we see the most successful people like warren buffet, bill gate and steve jobs and dhirubhai ambani all were not good at their education level but still they able to transform the life of millions of people around the globe so we cannot define sucess but these people have define sucess in their own words and now they are pioneer in their field so instead of every good parents say study ard people are now saying their children be like them.it's the sucess ok, Sucess cannot be defined but can be demonstrated .