What does vedas say about our universe age? And how it will be used to calculate the age of our universe? I will explain, using the age of universe, by taking brahma’s age as the base for the caluculation.
Vedas say that before the creation of the universe Lord Vishnu is sleeping in the ocean of all causes.
His bed is a giant serpent with thousands of cobra like hoods. By the way, in the trinity of Creator, Maintainer and Destroyer as mentioned in the vedas, Lord Vishnu is the maintainer. Brahma is the creator and Shiva the destroyer.
While Vishnu is asleep, a lotus sprouts of his navel (note that navel is symbolised as the root of creation!). Inside this lotus, Brahma is born. Brahma creates the universe which we all live in.
Brahma himself may be the universe as well, which is why the vedic texts say Brahmand meaning Universe. I speculate here that so this universe created from the navel (which is a single point) may well be referring to the universe created out of bigbang! Which is why it is described as lotus blooms out of the navel, much like our big bang universe.
Now this universe is not a permanent universe, it is temporary, Brahma lives for 100 years say the vedas and then dies and then a new universe is born. So as per vedas our universe lives for 100 years.
For now, brahma represents our universe which has birth and death, a big bang and a big cruch, from a navel singularity. Vishnu represents the eternity that lies beyond our universe which has no birth or death and that which is eternal!
Vedas say that thousands of brahmas have passed away! In other words, this is not the first time universe has been created.
Let us come back to the time measurements now. Brahma lives for hundred years say vedas and we are in the first day of the 51st year of the brahma.
A Year of Brahma :
A kalpa is made up of brahma’s one day and one night. (i.e day + night = 1 kalpa)
(i.e [ day = 14 Manvantaras && night = 14 Manvantaras ] = 28 Manvantaras )
But then Brahma is resting in the night, so lets get back to the day again.
[Treta Yuga lasts for 30% of its Mahayuga]
[Dwapara Yuga lasts for 20% of its Mahayuga]
[Kali Yuga lasts for 10% of its Mahayuga]
//That would be reverse calculations//
1 Manvantara = 71 Mahayugas
1 day of Brahma(excluding night)= 14 Manvantaras = (14*71 = 994 Mahayugas)
Vedas also say that before and after each Manvantara there is a gap equivalent to 4 Yugas (Not MahaYugas).
= 994 Mahayugas + 60 Yugas
= 994 Mahayugas + 6 MahaYugas = 1000
Now lets find out the age of our universe as per the vedas.
II. This is equivalent to 18000 x 2000 x 4320000 Human Years
III. In other words 155,520,000,000,000 Human Years
IV. Add the current day of Brahma which is1,972,944,456 Humans Years
The universe mentioned in vedas is the mother of all universes (a multiverse probably) including our own universe !!!
II. Dwapara Yuga = 1,000 Years
III. Treta Yuga = 10,000 Years
IV. Satya Yuga = 1,00,000 Years.