Noting the turnoff mass in a star cluster allows you to determine its:

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Noting the turnoff mass in a star cluster allows us to determine its age through a process known as the age-dating technique. This technique is based on the understanding that more massive stars have shorter lifetimes, and using the turnoff mass, we can estimate the age of the cluster. The other options cannot be determined solely by the turnoff mass. Noting the turnoff mass in a star cluster allows you to determine its age. The turnoff point is the point on the HR diagram where young, massive stars have just begun to exhaust their hydrogen fuel and leave the main sequence. By determining when these stars have left the main sequence, you can infer the age of the star cluster.

Noting the Turnoff Mass in a Star Cluster Allows You