Ok, you're right that it depends on what you count as a tree. An aspen "colony" is a living organism, and its "trees" visible aboveground are merely its stems.

Ok, you're right that it depends on what you count as a tree. An aspen "colony" is a living organism, and its "trees" visible aboveground are merely its stems. Such organisms may live as long as 1,000,000 years.