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Our sun is 4,500,000,000 years old. That's a lot of zeroes. That’s four and a half billion. How do we know the Sun's age?
The Sun is about 4.6 billion years old - gauged on the age of other objects in the Solar System that formed around the same time. And, based on observations of other stars, astronomers predict it will reach the end of its life in about another 10 billion years.