How old are stars in galaxy?

Question

The scientists say that in the centre galaxy stars are oldest .

But as I now the galaxy is expanding all the time from the beginning of universe .

Than Why not in the centre are not the youngest stars and in the end of galaxy are not oldest.

Answer 1

current theory is around 13 Billion years, I thought the Universe was like an expanding Bubble, there is nothing in the center

Answer 2

in our galaxy, they can be anywhere from a few years old to billions of years old.

Answer 3

Stars are a bit over 6,000 years old. We see super novas. They occur about every 25 years. We only see about 300 of these. If the stars are billion and billions of years old why do we only see about 300 super nova rings.  

Answer 4

There is considerable star formation in the center of the galaxy.  So there are young stars there too.  And the reason this happens is that the spiral arms have a tendency to sweep gas and dust to the center.  It used to be thought that it was too hot near the center for star formation to take place.  I'm not sure if this is still an open question.

Large stars live shorter lives.  So the oldest stars in the galaxy are often the little tiny ones.  It doesn't matter that much where they are.

But consider that the galaxy is over 13 billion years old.  It would have been smaller back then.  The stars that formed back then that still exist would now be mostly in the middle of the current much larger galaxy.  So that's why you may have heard that the oldest stars are in the center.

Some of the oldest globular clusters have the oldest stars yet detected.

Answer 5

What you must understand is that science really does not know.  It is likely that the known visible universe is about 15 Billion years old, based on observable phenomenon.  Astronomers say they can look back into time by looking at the light from the expanding universe.  The older the light, the farther in time they can see.  Problem is, what was there before the generation of light and energy?  Is time constant as it passes through the universe, and is the speed of light from the center of the universe hardwired to be a galactic speed limit?  Truth is, we just don't know.