Let me get this straight, there was an explosion (that came from nothing, anyway...) There was an/this explosion of matter/material/energy from a single center point (of origin) in/of the universe that would be the center of the universe, that everything would be expanding from away from, (in way as would happen as an explosion), if the universe is truly accelerating in that expansion, (and I think it is, but we'll get to that later) approximately 13-14 billion years ago, right...?
The numbers are astounding... The observable universe now, let alone the "entire universe"... There are trillions, or is it hundreds of trillions, I can't remember...? Anyway, at least multiple trillions of galaxies, each containing hundreds of billions of stars and star systems, and God knows how many planets in what is now the observable universe to us and they've hit a limit, it's as far as we can see with our technology and technological level right now for some reason, the observable universe is 46.5 billion light years around us, still no definable center...
The fact is is that the universe is really not behaving like it originated or is or has originated from a single center point explosion, and it is beginning to look less and less like that, but there is no current explanation for it so, nothing has changed (yet)... The universe "is expanding and seems to be speeding up", but, like I said, it is expanding or appears to be expanding but not like it originated from one single center point of origin... In fact it may be expanding and accelerating in direct counter-force, or in direct proportion to, the force that would cause it all collapse in on itself, and the universe could be perpetual, or nearly perpetual, due to this balance...
Then there is the "vantage point" issue... There is no way to know where the center of the universe, nor even if it even has a center, because from anywhere you are in it, even if it did all come from one single point of origin, and it (the universe) is expanding outward from that, and it is accelerating, if you were a a particle in the in the middle of a wave of particles being exploded from it (the center) (that one single point of origin "only 13-14 billion years old") (get to that in a bit)...
From where you were as the particle, you are in motion with the explosion, and if you were to examine your surroundings, from anywhere you were in the universe, looking at the other particles around you, it would seem that they are all proceeding at equidistant speeds in all directions proportional, all outward and away from you and it always seems as if you are the center, so how do you know if your in the center..? You can't... How do you detect or locate or somehow determine or measure the center...? You can't...
From any vantage point, even if you were truly in the center, it would be just like being anywhere else in it (the universe), so how would you know the difference...? And then like I said, it doesn't seem to be accelerating and expanding outward "FROM A SINGLE POINT OF ORIGIN", yet, and I don't know that it ever will...
Anyway, Then there is the age issue...? If the universe is only 13-14 billion years old, how come we can see 46.5 billion light years away from us in all directions, it would be 46.5 billion years old or from 46.5 billion years ago...? Then, How did all that matter and material get that far away from us if the universe is only 13-14 billion years old...? And that is only the observable universe, many theorize that the there much more, maybe very much more, maybe spanning for trillions light years... But it's all only 13-14 billion years old...? Doesn't make sense at all...?
It would have had to have been traveling or all moving a multiple times the speed of light, and we know it is accelerating and expanding, but not that fast, not by a long shot, so how's that work...? And it's supposed to be moving even faster than that due to accelerating...? What??? How's that work...? Matter cannot travel past the speed of light, let alone multiple times it, it doesn't make sense...?
I think the universe is older, maybe even much older, or very much more older, possibly than we ever thought it was, or maybe even perhaps we ever imagined it to be, and I don't know about it's coming from a single center point of origin, but that's just me...
Then let's not even get into gravitation, time, dimension and how that all comes to play with all of this...
God Bless!