Dendrochronology, also called tree-ring dating, the scientific discipline concerned with dating and interpreting past events, particularly paleoclimates and climatic trends, based on the analysis of tree rings.

What are people who study tree rings called?

Dendrochronology - The Study of Tree Rings (U.S. National Park Service)

What are the oldest trees?

The Great Basin Bristlecone Pine (Pinus Longaeva) has been deemed the oldest tree in existence, reaching an age of over 5,000 years old. The Bristlecone pines success in living a long life can be contributed to the harsh conditions it lives in.