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You cannot determine the age of a star based on it's luminosity or spectral class.

However, you can make *assumptions*.

OB and A stars are massive and will have a short lifespan in the millions of years.
FG and K stars have a longer life period - in the billions of years.
KMWLY and T stars are stars those that cause problems.

Most stars in this class are red dwarfs, stars that are so low in mass that they have a low rate of nuclear fusion and last for tens of billions of years.

In general - and I mean in general - a redder shift, should indicate an older star but you cannot use the HR- Diagram to determine this.

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15y ago

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