As soon as we are born, we are sentenced to death. It is just that we do not know when our turn will come. We try hard to be content and practice that contentment for as long as we could but we cannot be complacent.
It does not mean that we should not try to be content or by practicing it we just waste our time. In fact, finding out the good qualities and trying to develop them to the full is something that has worth for, and we surely get benefited by it, sooner or later, less or more.