Is the sun median size compared to other stars?

Among stars supporting progressive fusion reactions, the Sun is below average in size. However, astronomers estimate that as many as 75% of all stars in the visible universe are red dwarfs, which are considerably smaller than the Sun.

As it ages, the Sun will eventually lose luminosity but expand in size. Over billions of years, it will become a red giant star, and when that phase ends, its core will form a white dwarf.