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Shape
Elliptical galaxies are spherical, whereas spiral and lenticular galaxies are flatter. Elliptical galaxies have long been thought to be older galaxies, Sloan Digital Sky Survey says, and are composed primarily of older stars.
Composition
Elliptical galaxies have less interstellar gas and dust than other galaxies, according to dictionary.com. Since these are the raw materials by which stars are formed, most of the stars in an elliptical galaxy are older, red stars, says Sloan Digital Sky Survey.
Red Stars
Young stars tend to be small and yellow, or large and blue. As stars age, they expand and cool, and become either red giants or red supergiants. These red stars are the type primarily found in elliptical galaxies.