Meaning -
O man, for you we fix a hundred years, and ten thousand years, and, further, ten thousand multiplied by two, three and four, years of age. May Indra and Agni and all Vishvedevas, divinities of nature and humanity, without hesitation and reservation be favourable and support you. (This is a metaphorical and highly mystical mantra which describes the age of the individual person and the age of humanity on earth. The age of the individual is one hundred years, while the age of humanity in each creation cycle is four billion and three hundred and twenty million years.) Satavalekara explains the mantra in a simple manner: We fix a hundred year uninterrupted age for you. There are two yugas, sandhi transitions of morning and evening of the day, three seasons of winter, summer and rains, and four periods of life, Brahmacharya upto 25 years, grhastha upto 50 years, vanaprastha upto 75 years, and sanyasa upto 100 years. The mystical interpretation of the mantra is that the age of humanity is 4,32,00,00,000 (four billion and three hundred and twenty million) years divided over one thousand four-yuga divisions of 43,20000 years each (which is ‘niyuta’, 10,000, multiplied by 432): Kaliyuga 4,32,000 years Dvapara yuga 8,64,000 years Treta yuga 12,96,000 years Satyuga Total 17,28,000 years 43,20,000 years For further details, reference may be made to Kshema-karana Dasa Trivedi’s comment on this mantra in his translation of Atharva-Veda published by Sarvadeshika Arya Pratinidhi Sabha, Delhi.