What concern arises from the extreme age of globular cluster stars regarding life evolution?

Answer

The window for habitable planet formation and evolution might be closing or have already passed for the initial inhabitants.

Since the clusters are so old, many initial sun-like stars may have exhausted their fuel or swelled into red giants, raising the question of whether the habitable window has already closed.

What concern arises from the extreme age of globular cluster stars regarding life evolution?

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