Speaking in astronomical terms there is no determined color for old dying stars. It just matters what type of star it is. For example, red giants like Betelgeuse or Antares are the most common stars these red giants also are in the same class as hyper giants a more massive red star. They generally go from a living bright orange to a dying dark red.
bascially it blue-white
the blue star is the youngest and the largest star,.,.,.it's blue
The largest main sequence stars are blue.
The color of a star indicates its temperature. Blue or white stars are the hottest and smallest. Red or orange stars are the coolest and largest. Stars like our sun with a yellow color are medium in both size and temperature. Generally, the smaller a star is the hotter it is.
Trifid is a nebula, not a star. For a the largest star, see related question.
The largest type of star is a hypergiant.VY Canis Majoris is the largest known star. It is 2,100 times larger than our own Sun.
The color of the star Indicates its Temperature.
sunflower star
the color of the star regulus is blue-white
The hotter the star, the closer to white the color.
the color of a young star is *bluish white*
binary star
VY Canis Majoris is the largest known star. It is a red hypergiant star.