what is considered the oldest organism
stream/download this segment as an MP3 file. A small section of Pando. (Photo: Paul C. Rogers, Western Aspen Alliance). The worldâs largest and possibly oldest living organism is Pando, a Quaking Aspen clone in Utah.Karen Mock, Professor of Molecular Ecology at Utah State University tells host Steve Curwood that precise estimates about the age of Pando are not currently possible, but it may be many thousands of years old.hat means it started sprouting when modern humans were migrating out of Africa. But the worldâs largest organism is now under threat. Here to explain why are Paul Rogers, Director of the Western Aspen Alliance at Utah State University and Karen Mock, Professor of Conservation Genetics and Molecular Ecology at USU.