What does it mean to ask for a visa to explain that "there are not many floating lives in the future, if you dream of happiness"?

Many days have passed and there are not many days left in this world. This life is like a dream, and how many happy times are there? It is a nostalgia for the lost time and a regret for wasting time. At this time, it usually means that he is old or seriously ill and dying, let alone having fun again.