I have a question regarding the age of the universe and black holes. The oldest star is deemed to be about 13.2 billion y old. The universe is estimated at about 13.7.
How can we really know how old the universe is if we can't age a black hole? The black hole is the end result of the life of a massive star.
Can someone fill me in on how we estimate the age of stars and thereby assume an age to the universe?