Death is certain, but when it will arrive is not. One thing that’s for sure is that we are not going to live for one hundred years. One hundred years from now, pretty much everybody alive today will be dead. It is very important to remember impermanence. The Kadampa geshes used to remember impermanence all the time in order to avoid seeking the comfort of the temporal life. They felt that if they didn’t bring it to mind in the morning they were in danger of wasting the entire afternoon, and if they didn’t bring it to mind in the afternoon they were in danger of wasting the whole night. By constantly keeping impermanence in mind, they were able to prevent the meaningless thought seeking only the comfort of this life from arising.
Khunu Lama Rinpoche