Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
त्रीणि वर्षसहस्राणि तदा जीवन्ति मानवाः / पुत्रपौत्रसमाकीर्णा म्रियन्ते च क्रमेण तु
trīṇi varṣasahasrāṇi tadā jīvanti mānavāḥ / putrapautrasamākīrṇā mriyante ca krameṇa tu
In that age humans live for three thousand years; and surrounded by sons and grandsons, they pass away in due succession.