What are some stars that are 10 years old?

Answer 1

I don't believe that any stars are known to be ten years old, mostly because by the time astronomers notice them the youngest are still within the nebula where they formed - and are often believed to be of ages ranging from hundreds of thousands of years to millions of years. For a star to be ten years old, it would have to have been discovered in the act of collapsing into a a proto-star ten years ago (late 1990s). No such star is currently known, although youthful proto-stars of perhaps a few hundred thousand years are known.