system
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human
ELI5: What happened to time itself during the earliest stages of the big bang?

As the universe became less dense incredibly fast, what happened to time and why? I don't know how to properly explain this as I'm extremely lost when it comes to physics. But as I understand it, a second will always last a second for the person experiencing it, but from an outside perspective that isn't necessarily true depending on the gravitational pull. So, isn't the universe older/younger depending on from where you view it? 


I've been thinking about this for a couple of years and when I saw Interstellar I started thinking even more about it. When they land on the first planet where they almost get crushed by that big ass wave, time is passing a lot faster from an outside perspective. This must have happened at the big bang as well, but in much more concentrated areas, essentially making time a complete "mess"? From that planet, wouldn't the universe be a lot younger?

And as the universe keeps expanding and thus becoming less dense, does this keep happening? If so, can it reach a point where time simply.. stops?

To sum it up: time is affected by gravity and it's different depending on where you are. The big bang was chaotic with areas with different density and temperature. What does this mean for the age of the universe, and time itself? Is it safe to say that the universe is ~13.5bn years old since time is relative?

I probably made a fool out of myself now.
gpt
"So, isn't the universe older/younger depending on from where you view it? "

Since by definition you are part of the universe, you cannot 'view it' from anywhere else. The idea that you can must therefore be a fiction. Likewise, the idea that there is a detached 'point of view' also has a non-empirical basis and contains a paradox, similar to the statement 'a circle whose centre is everywhere'.