What is the oldest thing that exists today?

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Tags

1. #dated
2. #making
3. #material
4. #years
5. #crust
6. #crystal
7. #known
8. #about
9. #1zircon
10. #zircon
11. #ancient
12. #confirmed
13. #earth
14. #formed
15. #piece
16. #scientists
17. #earliest
18. #oldest
19. #planet
20. #billion