Falsifying a young Universe. (re: Supernova 1987A)

I normally stay out of this kind of topic because I just don't understand it, but my usual answer to the apparent great age of the universe is that time appears to be something different on the scale of astronomy than it is to us on Earth. I don't understand this, how it could be or what it means in terms of physics etc., but I keep thinking about the claims that a person traveling astronomical distances would not age as he would on Earth. That suggests that there is a big difference in how time works on these different scales, which seems to be related to what you are saying.Edited by Faith, : No reason given.

But that's still a puzzle. Why should the speed of travel change how the traveler ages? The idea is that after this trip at great speed to great distances the person returns to earth having aged not a bit or something like that, while time on earth has continued to a future he no longer fits into. Can you make sense out of that for me?Edited by Faith, : No reason given.