No. Fat people (as the article describes) do not live longer. We all know that people with significant excess weight are at a higher risk for heart disease, diabetes, cancer, knee pain… you name it.
But what if those extra 10-15 pounds you just can’t loose might help you live longer? According to this article, they just might. This article is full of really great information about your weight and how it affects your health (with links for the sited research throughout).
The few extra pounds you have give your body extra nutrients it needs in a traumatic injury or if you are trying to recover from a catabolic illness. For more on this; see the above article.