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Śrīmad-Bhāgavatam
[Canto 4, Ch.9]
With the progressive advance of each new  yuga , the duration of human life is reduced by ninety percent—from 100,000 to 10,000, from 10,000 to 1,000, and from 1,000 to 100.
It is said that Dhruva Mahārāja is the great-grandson of Lord Brahmā. This indicates that Dhruva Mahārāja's time was in the Satya-yuga in the beginning of creation. During one day of Lord Brahmā, as stated in the  Bhagavad-gītā , there are many Satya-yugas. According to the Vedic calculation, at the present moment the twenty-eighth millennium is current. It can be calculated that Dhruva Mahārāja lived many millions of years ago, but the description of the palace of Dhruva's father is so glorious that we cannot accept that advanced human civilization did not exist even 40,000 or 50,000 years ago. There were walls like those in the palace of Mahārāja Uttānapāda even very recently, during the Mogul period. Anyone who has seen the Red Fort in Delhi must have marked that the walls were made of marble and were once decorated with jewels. During the British Period all these jewels were taken away and dispatched to the British Museum.
The conception of worldly opulence was formerly based mainly on natural resources such as jewels, marble, silk, ivory, gold and silver. The advancement of economic development was not based on big motor cars. Advancement of human civilization does not depend on industrial enterprises, but on possession of natural wealth and natural food, which is all supplied by the Supreme Personality of Godhead so that we may save time for self-realization and success in the human form of body.
Another aspect of this verse is that Dhruva Mahārāja's father, Uttānapāda, would very soon give up attachment for his palaces and would go to the forest for self-realization. From the description of  Śrīmad-Bhāgavatam , therefore, we can make a very thorough comparative study of modern civilization and the civilization of mankind in the other millenniums, Satya-yuga, Tretā-yuga and Dvāpara-yuga.
TEXT 63
उद्यानानि च रम्याणि विचित्रैरमरद्रुमैः ।
कूजद्विहङ्गमिथुनैर्गायन्मत्तमधुव्रतैः
॥६३॥
udyānāni ca ramyāṇi
vicitrair amara-drumaiḥ
kūja-dvihaṅga-mithunair
gāyan-matta-madhuvrataiḥ