That poll question is tough for old guys who have lots of old stuff. My first thought was my Roman coin that came from Bath, England. About 1500 years old, I would guess. Then I thought about a box of arrow head in my shop. One was in my garden and one was in my front yard. The others came from all over the place. They could easily be from Tennessee's Early Woodland Indians, who have been gone more than 1500 years. But then think of the flint. Rocks are usually millions of years old.
Howard