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How many universes or galaxies are there in outer space? How old is the oldest galaxy and universe?

Answer 1

No one knows.
The universe is around 13 billion years old.

There are billions, perhaps even millions, of galaxies. The universe is estimated to be around 13 billion years old, so the oldest galaxy may be between 11 and 12 billion years old.

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Answer 2

Alexander Acosta

The exact number of galaxies in the universe is not known, but estimates suggest there are billions or even trillions. The oldest known galaxy is GN-z11, estimated to be around 13.4 billion years old. The age of the universe is approximately 13.8 billion years.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.