The lifespan of a star varies greatly. The range seems to be from thousands of years for large stars to billions of years for smaller stars. So it seems the more massive a star is the shorter its life span will be. Experts predict that our sun, which is of average mass, will have a total lifespan of 10 billion years. For more information on how you can determine the age of a star see this web page.
Most stars are betwen 1 billion and 10 billion years old. The oldest star yet discovered is HE 1523-0901 at an estimated 13.2 billion years old. The more massive the star, the shorter its lifespan, because massive stars have greater pressure on their cores, causing them to burn hydrogen more rapidly. The most massive stars last an average of about 1 million years, while stars with less mass such as red dwarfs burn their fuel very slowly and can last tens to hundreds of billions of years.
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