For this, I consulted the best place to go for records… the Guinness Book of World Records! There is a mountain in South Africa (Barberton Greenstone) that’s 3.6 billion years old! For reference, the Earth was formed about 4.5 billion years ago! https://www.guinnessworldrecords.com/world-records/112979-oldest-mountain-range
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anon-278661 commented on :
Thanks for answering!