What spectral type of star that is still around formed longest ago?

Question

Quizplus · Accepted Answer

Stars with lower mass have longer lifetimes, meaning that they formed longer ago than higher mass stars. M-type stars are the lowest mass and longest-lived stars, so they would be the most likely to still be around from the early universe. Stars of spectral type M have the longest lifespan and are therefore the oldest stars still around in the universe. These stars have a lower mass than other spectral types, which means they burn their fuel at a slower rate and live longer. Therefore, it is most likely that the oldest stars we observe today are of spectral type M.

What Spectral Type of Star That Is Still Around Formed