This is what I do know, Mathematics and Science. I know if we had a spaceship with a fuselage big enough, that from Adam to now, we would not be very from Earth into Space. When it takes 3 human days to get our moon, 140 days to get to Mars, multiple years to get to Pluto, it's virtually impossible to even travel to the next Galaxy out there.
Now grasp this, I beg of you.
Space is vast and endless, If we could travel from Earth to deep Space, it literally would take the lifespan of the 1.2 Million people living to at least 70 years to reach our closest Galaxy. So knowing that from the Earth to our closest Galaxy is literally 84 million years in travel to reach, how can the Universe be only 6,000 years old? That's why they discuss going to Mars because there is no possible way for a human being to travel out of our own Galaxy. And that distance to our closest Galaxy is foolish to measure by mileage because no one could live long enough to get 1/8 of the way there.
So, when we begin discussing things are big in terms of lifetimes, in hundred thousand years, in million years, Space has to be that old to be that big. Granted, God could just made it that big. But we can actually measure Space using high powered satellite vision that can read a dime on a sidewalk from literally 10 atmospheres outside of Earth along with our vision scopes on Earth. So, knowing that Space keeps growing bigger, means the time it would take in travel distance keeps growing.
Basically, you cannot travel further than how old something is in terms of Space!