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The Barberton Greenstone Belt in South Africa is estimated at 3.4-3.6 billion years old, and generally regarded as the world's oldest mountains. Their age is indisputedly older than anything in North America (the Appalachians / Blach Hills / Porcupines / Smokies etc) and only Western Australia lays a possible claim.
Answer Wiki. , Read a bit, learned a bit. Much more to read, much more to learn. Because he was the founder and driver of the Indian Survey which discovered that Everest was the highest mountain in the world. Views Â· View Upvotes.