In this age human beings only live for sixty or eighty years, and even this small life-span is gradually decreasing. Therefore it is even more imperative for human beings to take to the worship of the lotus feet of the Lord by constantly chanting the Hare Krishna mantra, as recommended by Lord Caitanya Mahaprabhu. (Srimad-Bhagavatam, 4.24.67 Purport)
(via Imperative for human beings to take to the worship of the lotus feet of the Lord)