The oldest trees on Earth

High atop the remote, rocky slopes of California's White Mountains, the harsh conditions make it difficult for life to take root. But for a certain type of tree – and for those who have traveled here to study it – this place is paradise. 

These gnarled bristlecone pines are the oldest individual trees in the world. Researchers like Andy Bunn have come to learn from the ancients.

Correspondent Conor Knighton asked Bunn, "Looking at this tree, would you have any idea how old this is?"