Expectation and Disappointment
It is stated that people mostly live their life with some expectations, for example, they want to live the longest life like 80 years, 90 years, or a hundred year. However, they are disappointed as most of them cannot get what they expect or want as life is impermanent and unpredictable. However, if they are just happy to live until they die naturally, they will not be disappointed. They will live a happy life as long as their life would last. So, no expectation is no disappointment.