The Universe is 13.8 billions years old. Now someone suggests it's age is infinite, that is, it has no beginning. What do you think?

It's not a matter of what I think, or anyone thinks, it's all down to what the observations of the evidence tell us.

What we do know right now is that we simply can't extrapolate back further than a few billionths of a second after the big bang. Time for us starts then with the divergence of the fundamental forces. In that sense the 13.82 billion age of the cosmos stands and other than constant refinements to the precise age of the universe it is the only time-scale we'll ever have to work with. What time means before the point where time actually exists is currently unanswerable with pure mathematics our only guide.

The event one singularity has been falling out of favour in some areas of theoretical physics for a while so I guess I'm not surprised that some cosmologists are looking at new explanations, but the fact remains that this, like more mainstream interpretations are pure theoretical modelling into a realm beyond where our physics make no sense. Our universe as it currently is, is a finite system. It has only existed (at least in present form) for a limited time, contains limited energy and is subject to the continual increase in entropy. Its unbounded in it's expansion but that's just spreading the same limited energy out over greater distances. One day there will be a point where entropy has run it's course and the arrow of time ends. There may well be more to the cosmos than just our universe - but there is no proof of that, at least for now.

And since you did ask and I ought to answer, I personally suspect the universe is just one bubble of many in an extended cosmos teeming with many trillions of other universes, each with their own timescales and slight variations in physical laws. This cosmological process of systems falling out of equlibrium, becoming self-contained universes then slowly returning to equilibrium over immense local time-scales has likely been going on eternally. But that's just what I think and consequently means very little as I'm neither a cosmologist or good at maths.

"The total energy of the universe is the same today as it was yesterday as it will be tomorrow - ALWAYS." ©

(conservation of energy)

That's regardless of whether the Universe progresses to a Big Rip or a Big Crunch, the total energy does not change. The universe can therefore never end (nor have a beginning) it can (as with energy) only change form.

Ps : its not only the universe which has no beginning nor end, it's everything in the universe.

Nothing has a definitive beginning or end. Period. (conservation of energy)

All the best.

Well, philosophically speaking (and I think that's the only way you can speak of questions like this) if there was NO-thing before the BB and will be NO-thing after the end of time and space (ie.the universe) then it is infinite isn't it? For the time being anyway.

As for intangible concepts like infinity....do they exist outside of time and space as well as within? I like to think so. We don't know everything after all.

I certainly don't believe the universe is 13.8 billion years old. If you are saying unlimited or unmeasurable, I would agree. God is the beginning and the ending; the first and the last and the Alpha and Omega. God said He stretched the heavens out like a curtain and science says they keep expanding. As for the earth, God holds it together by His power. 'Colossians 1:16, 17 For by Him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions or principalities, or powers, all things were created by Him, for Him. And He is before all things and by Him all things consist." and Verse 19 "For it pleased that in Him should all fullness dwell."

That someone's got some esplainin' to do.

I think that person has been taking drugs. The Universe had a beginning and eventually it will come to an end. We just don't know when.

The "first second" of the Big Bang contains a lot of unknown physics. It's certainly possible that the "first second" was actually past eternal in some sense, and there are well-respected theories that suggest that might be so --- and some of those theories have been around for decades. "Ongoing eternal inflation" is one such theory. Those theories are all variants of the Big Bang theory.

Anyone who suggests that the Big Bang theory is therefore "wrong" in some way is just wrong themselves. The Big Bang theory (after the first second) is definitively confirmed by thousands of observations.

The universe *is* infinite in time and space, but not because of what what that article claims. This documentary may enlighten you:

https://www.youtube.com/watch?v=IFFl9S39CTM

There never was a Big Bang.

That someone is on crack. The universe is not infinite.

I think they're lying.