Wow! I had heard of the Hundred Horse Chestnut in Sicily which is between 2000 and 4000 years old, but that is something: 80,000 year! Anot her TED talk on my "To watch" list.
What does a metric clock look like? I bet it is nothing like this tiny ad:
Quit your workee-job and live, year round, for free-ish in Montana