Your oldest possession →[More:]Not the item that was created farthest back in history, mind you. The one you've held ownership of the longest. So: a Civil War document bequeathed to you last week would count less than a magazine you purchased last month.
I still have something I found on the street in front of my house at least 35 years ago - two unmatched rabbit feet bound together on a short chain. I'm still here, so they must work.