I think it depends. For different people have different understanding of success.
Just like the first example, the rich but lonely man, most of us may not think he is a success.But what if he himself enjoys all his life?
In my point of view, it is our own dream and the hardwork to achieve our goal make a successful life.First ,we should have a goal.Second,the strong determination play an important role on our way to success.Third,it is the indispensable hardwork,no one could success without it.The last also the vital point,be yourself,do what you want to do no matter what others think about you!