Vishnupurana 6.1.48

6.1.48

yadāyāda na yajñānāmīśvaraḥ puruṣottamaḥ /
ijyate puruṣair yajñais tadā jñeyaṃ kaler balam //

Oppressed by famine and taxation, men will desert their native lands, and go to those countries which are fit for coarser grains. The path of the Vedas being obliterated, and men having deviated into heresy, iniquity will flourish, and the duration of life will therefore decrease. In consequence of horrible penances not enjoined by scripture, and of the vices of the rulers, children will die in their infancy. Women will bear children at the age of five, six, or seven years; and men beget them when they are eight, nine, or ten. A man will be grey when he is twelve; and no one will exceed twenty years of life. Men will possess little sense, vigour, or virtue, and will therefore perish in a very brief period. In proportion as heresy extends, so, Maitreya, shall the progress of the Kali age be estimated by the wise. In proportion as the number of the pious, who adhere to the lessons of the Vedas, diminishes--as the efforts of individuals who cultivate virtue relax--as the first of males becomes no longer the object of sacrifices--as respect for the teachers of the Vedas declines--and as regard is acknowledged for the disseminators of heresy--so may wise men note the augmented influence of the Kali age.