I found a 79 year old nickel a few days ago. For those who collect coins, what is the oldest one you have found

I found a 1946 penny in my backyard when I was in high school. The original house on that lot had been built in 1946 so it was probably right from around when the original house was brand new. 

70 years.  It was a walking liberty half dollar.  I found it in my backyard while putting in a leach field.

When I was a kid I found an old Canadian 5 cent coin (when they were made like a dime only smaller) sitting on  top of a mole hill.in the school yard. I guess I never thought it might be worth something more than buying an ice cream cone (5 cents at the time ) so I went to the bank to ask the teller if I could get a real nickel for it which she gave me and I got my ice cream cone.  I don't think I even bothered looking at the date on it but if it was 1921 it could have been worth $300  - 500 dollars back then.

ive never collected coins but that one sounds like a good one to collect

I have some from the 1890s.