How do we know the age of the universe is 13.7 billion years?
We say the universe is 13.7 billion years old, while the farthest matter we have ‘looked’ at is about 480 million years older than our Universe’s supposed birth-moment
(to experts) Why haven’t we seen further than that? Is it because of the limitations of our equipment or because light from that far hasn’t reached us yet? And if we cannot see further than that, on what basis do we calculate the age of our universe?
This question is in the General Section. Responses must be helpful and on-topic.