Which astronomical object or system is likely to be the oldest?

Name: Which astronomical object or system is likely to be the oldest?
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Globular clusters are made up of old stars, typically over 10 billion years old, making them some of the oldest objects in the universe. The other objects listed, T Tauri stars, Pleiades, and the Sun, are relatively young in comparison, with ages of only a few million to a few billion years.

Which Astronomical Object or System Is Likely to Be the Oldest