The oldest open cluster known in the Milky Way is about 6 billion years younger than the average globular cluster.

Name: The oldest open cluster known in the Milky Way is about 6 billion years younger than the average globular cluster.
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The oldest open cluster known in the Milky Way, NGC 6791, is approximately 8 billion years old, which is actually older than some globular clusters. The average age of globular clusters is around 12-13 billion years old.

The Oldest Open Cluster Known in the Milky Way Is