The materialists want to prolong life as much as possible because they have no information of the next life. They want to get the maximum comforts in this present life because they think conclusively that there is no life after death. This ignorance about the eternity of the living being and the change of covering in the material world has played havoc in the structure of modern human society. Consequently there are many problems, multiplied by various plans of modernized man. The plans for solving the problems of society have only aggravated the troubles. Even if it is possible to prolong life more than one hundred years, advancement of human civilization does not necessarily follow. The Bhāgavatam says that certain trees live for hundreds and thousands of years. At Vṛndāvana there is a tamarind tree (the place is known as Imlitala) which is said to have existed since the time of Lord Kṛṣṇa. In the Calcutta Botanical Garden there is a banyan tree said to be older than five hundred years, and there are many such trees all over the world. Svāmī Śaṅkarācārya lived only thirty-two years, and Lord Caitanya lived forty-eight years. Does it mean that the prolonged lives of the above mentioned trees are more important than Śaṅkara or Caitanya? Prolonged life without spiritual value is not very important. One may doubt that trees have life because they do not breathe. But modern scientists like Bose have already proved that there is life in plants, so breathing is no sign of actual life.
Ref >> Srila Prabhupada Vani.