No. There are older things.
All of them are. Generally elliptical galaxies are the oldest.
the milky way is a galaxy. the universe is all of space.
The Universe. The Milky Way is equivalant of an atom of sand on the beach to the Earth as the Milky Way is to the Universe.Yes. The universe is everything in existence. The Milky Way is but a microscopic part of the universe.
No, there are thought to be other galaxies that are just as big, even bigger. The milky way isn't the only thing in the universe; even the universe itself is larger than the milky way. The Milky Way isn't even the biggest galaxy in our "neighborhood", galactically speaking. The Andromeda Galaxy appears to be about twice as big (though the jury's still out on which has more mass; the Milky Way may have a slight edge there).
It seems that there is no such thing as a "center of the Universe". Every place you are, the Universe will look the same.
No. The Milky Way is the name of one particular galaxy; the one we live in. There are many more galaxies in the universe.
Population II stars are the oldest in our Milky Way. Population III stars were the first stars in the Universe, but have yet to be discovered. See related question
No. There are many much larger galaxies in the Universe than the Milky Way.
No. The Milky Way is estimated to be nearly as old as the Universe itself.
Nope, other way around: The Milky Way - our home galaxy - is part of the universe.
The universe has NO center
Universe >> Milky Way galaxy >> Solar System > Sun >> Earth