Can you tell the age of a star by the intensity of its light?

Stars are born from the collapse of gas and dust within a molecular cloud. They go through various stages of development, and their age can be determined by looking at their spectral characteristics, which are determined by their surface temperature and composition.

The intensity of light emitted by a star can give us some information about its age. Younger stars tend to be brighter and hotter than older stars, while older stars tend to be dimmer and cooler. This is because as a star ages, it uses up its hydrogen fuel and its core contracts, causing the outer layers to expand and cool.

However, determining a star's age based solely on its light intensity can be difficult, as there are many other factors that can affect a star's brightness, such as its mass, composition, and distance from Earth. To get a more accurate determination of a star's age, astronomers use a variety of other techniques, such as measuring its rotation rate, its metallicity, and its position on the Hertzsprung-Russell diagram.