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Mountains may look ancient — but some are mere toddlers, while others are great-grandaddies, geologically speaking. So, what is the oldest mountain range? And what about the youngest? 

In general, tall mountain ranges, such as the Himalayas, tend to be young, whereas ranges with shorter peaks from millennia of erosion, like the Appalachians, are often older, according to the American Museum of Natural History in New York City. But due to Earth’s ever-changing topography, this superlative is hard to assign — and it demands an understanding of how these peaks rise and fall over time.

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