DNA samples from one of the world’s largest and oldest plants — a quaking aspen tree (Populus tremuloides) in Utah called Pando — have helped researchers to determine its age and revealed clues about its evolutionary history.

“It’s kind of shocking to me that there hasn’t been a lot of genetic interest in Pando already, given how cool it is,” says study co-author William Ratcliff, an associate professor in the  School of Biological Sciences.

By inputting Pando’s genetic data into a theoretical model that plots an organism’s evolutionary lineage, the researchers estimated Pando’s age. They put this at between 16,000 and 80,000 years. “It makes the Roman Empire seem like just a young, recent thing,” says Ratcliff.

(This also appeared at Newsweek and NewScientist.)