How old is the Milky Way galaxy

This is an interesting question.

I read the reference but there seems to be something missing in the explanation. The universe was supposed to be rather uniform in density but the earliest galaxies found existed only 500 million years after the universe started. That just seems like too short of a time for a galaxy to form from a uniform density environment. I don't know how dense the universe was 500 million years after the universe started but I imagine that it was already too sparse to pull in all that gas and dark matter together in that short of time.

So, when the universe formed it may have quickly organized to some extent into spinning clumps of matter.

If that's true, the Milky Way galaxy is approximately the same age as the universe itself (13.75 billion years) and so are most of, or all of the, other galaxies.

A sort of side issue to this is all the spinning in the universe - planets rotating, planets revolving, stars rotating, galaxies spinning, star and star system forming with spinning, etc. Why is everything spinning? There's lots of angular momentum in the universe for some reason. Perhaps the spinning and early clumping into galaxies are related somehow. Maybe it's something about the big bang itself.

You cant accurately predict the age of the galaxy. Without finding a first generation globular cluster, its impossibly hard to come up with anything more than a ballpark answer that's something along the lines of "Older than 14 Billion Years.."

The milky way galaxy is 120,000Ly in diameter, so definitely older than 120,000 years.

Our sun is the nearest of the 600 billion stars in this galaxy, is about 4.56 Billion years old so the milky ways probably older than that too.

The oldest star thats been observed in this galaxy was approximated to be about 13 Billion years old. Hence, the galaxy is most likely older than that as well.