Many consider aspen woodlands to be the most massive living organisms on the planet. The clones truly are one tree and can be vast. Your mother tree may be the oldest stem around, but I suspect the Being itself is much more ancient that it. It's difficult to age clones but the Pando clone is estimated to be 80,000 years old, and could be up to 1 million! There are other very large clones that remain unstudied.
In coastal old growth you are overwhelmed with an immediate sense of age and grandeur...it's more subtle in an aspen wood, but there if you are sensitive to that sort of thing.
As you spend time on your land you might be able to pick out different clones...they tend to shift colour at the same time in the fall, so you might notice patches in the forest...also they are dioecious, so groups of male and female trees will be part of different individual organisms.
Isolated clones make me think of the Ents...they do age, and their ability to sexually reproduce declines which puts them at risk as they cannot disperse and establish new clones.
quick summary here
we all gotta go sometime
or geek right out and read the paper
aging in a long lived clonal tree (thanks public library of science!)
Check out the Pando clone!
pando wiki
ah..posted at the same time, i see you're on it...