If the turnoff point in a cluster corresponds to stars five times the mass of the Sun, what does this imply about the cluster's age?

Answer

The cluster is relatively young, perhaps only a few hundred million years old

A star five times the Sun's mass burns fuel very quickly; therefore, if stars of this mass are just beginning to evolve off the main sequence, the cluster must be quite young.

If the turnoff point in a cluster corresponds to stars five times the mass of the Sun, what does this imply about the cluster's age?
ageSpaceastronomysciencestarsstellar evolutionage determination