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The reasons are:-
1. Decreasing fertility
2 . Environmental degradation
3 . Aryan invasion
4 . Earthquakes and epidemics
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Reason for the decline of Vedic age is:
i) The Mahabharata war resulted in the destruction of the vedic age.
ii) Decline of the power of the Aryan rulers,
iii) The occupation of warrior was confined to only the  Kshatriyas which was yet another downfall of this age.