Actually in this age one should live at least one hundred years, but because we do not follow hygienic rules, do not live nicely, extravagantly, therefore the duration of life is reduced. And we are proud that we are improving. We are proud of our so-called scientific education that is improving. What you are improving? You cannot live even for hundred years. So this is called māyā. Actually we are decreasing, but we are thinking improving.
So kalāv asmin yuge janāḥ, alpāyuṣaḥ. And gradually the duration of life will be reduced to twenty to thirty years. These are all stated in the śāstras. Śāstra means which is correct to the point. Just like this śāstra, Śrīmad-Bhāgavatam, it was compiled five thousand years ago, but the statements which are there, they are correct to the point, without any mistake, without any illusion. That is called śāstra. There cannot be any mistake. Just like in the Śrīmad-Bhāgavatam you'll find that in the beginning of this age Lord Buddha will appear: kīkaṭeṣu bhaviṣyati (SB 1.3.24).
Bhaviṣyati means "In future," because this book was written, or compiled, five thousand years ago, and Lord Buddha appeared 2,600 years ago. So therefore at that time it is future, bhaviṣyati. He says, Vyāsadeva says, that in future, kīkaṭeṣu, in the province known as Gayā Pradesh, Lord Buddha will appear, and his father's name is this and his mother's name is this. This is called śāstra. So we have to follow this śāstra, which is beyond the deception of our material life. We have got four kinds of deceptions, deficiencies, we conditioned souls; but those who are liberated, they are above this—transcendental life.