The stars at the turnoff point in the Hertzsprung-Russell diagram of the Hyades star cluster have a luminosity of approximately 10 times that of the Sun, while those at the turnoff point in the cluster M41 have a luminosity of about 80 times that of the Sun. From this information, it can be said with certainty that the Hyades cluster

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The turnoff point on the Hertzsprung-Russell diagram indicates the stage at which stars leave the main sequence. A higher luminosity at the turnoff point (as in M41) suggests those stars are more massive and thus have shorter lifespans, indicating a younger cluster. Therefore, the Hyades, with a lower luminosity at the turnoff point, is older.

The Stars at the Turnoff Point in the Hertzsprung-Russell Diagram