Final answer:
The stars predicted to live approximately twice the current age of the universe are much less massive than our Sun. They are typically red dwarf stars, which are known for their long lifespans that can extend to tens or even hundreds of billions of years, due to their efficient fuel consumption.
Step-by-step explanation:
The mass of stars that are estimated to live approximately twice the current age of the universe would likely be considerably smaller than the mass of our Sun. This is because stars with lower mass burn their fuel more slowly and have longer lifespans. For example, a star with a mass similar to or less than 1.4 times the mass of our Sun will end up with a final mass less than this after expelling some of its mass over its lifetime. Most stars in the universe are actually of this smaller mass category; massive stars are relatively rare. Therefore, stars that will live twice the current age of the universe, which is approximately 13.8 billion years, would typically be much less massive than our Sun. Those are likely red dwarf stars, which can have lifespans of tens to hundreds of billions of years due to their efficient use of hydrogen fuel.