As a human, you can probably expect to live for under a hundred years. Those of us who make it beyond the century mark are usually marveled at — but even the oldest of our species hasn’t lived past 122.

There are organisms, on the other hand, that have been in existence for the entirety of human civilization — some much longer than that, like Pando, the aspen-tree colony that has been alive for 80,000 years. Joe Hanson, host of the always-awesome YouTube channel It’s Okay to Be Smart, explains what some of our oldest living organisms on the planet are, and how it is they got to be that way.