Of course, there are other yugas besides Kali-yuga. During the Satya-yuga, which lasted eighteen hundred thousand years, human beings lived for one hundred thousand years. The duration of the next age, the Tretä-yuga, was twelve hundred thousand years, and the people of that age used to live for ten thousand years. In other words, the duration of life was ten times reduced. In the next age, Dväpara-yuga, the life span was again ten times reduced—people used to live for one thousand years—and the duration of the Dväpara Age was eight hundred thousand years. Then, in the next age, this Kali-yuga, we can live up to one hundred years at the utmost. We are not living one hundred years, but still, the limit is one hundred years. So just see: from one hundred years the average duration of life has decreased to about seventy years. And it will eventually decrease to the point where if a man lives for twenty to thirty years, he will be considered a very old man.