[jimmyray]

If the universe is only 6,000 years old, then how can it contain quasars that are 28 billion light years distant from Earth?

And if the universe is only 15 Billion years old, how can we see these quasars that are 28 billion light years away?

[GourmetDan]

"If the universe is only 6,000 years old, then how can it contain quasars that are 28 billion light years distant from Earth?"

"And if the universe is only 15 Billion years old, how can we see these quasars that are 28 billion light years away?"

There are so many assumptions built into these 'long-ages' that nobody should take them seriously.

How do you prove that the speed of light has been constant over an assumed 15-28 billion years?

You can't.

It is assumed.