What is wrong with being old and out of shape?
There's nothing wrong with being old ! ( out of shape however, does not contribute to GETTING old ! )
Why do we keep classifying nudists based on their body types?
That's a good question.
The answer likely has something to do with motivation. Why is one a "nudist" at all ?
I suppose it's possible for young and beautiful to feel out of place ( as I sometimes do

) but wouldn't that be true in the textile world just as much ?
Additionally, I have seen a newsreel or two, from the 40's or 60's, or whatever. Something a few decades ago in any case, where they do say that nudists tend to be ( at that time anyway ) in much better shape than the general population. The reasoning being that since we are much more aware of our bodies, we tend to take better care of them, since any defect of choice is no longer hidden by clothing. That the "lifestyle" itself, lends itself to better health, more exercise, a more aware diet, and such. Also suggesting that we ALL, nudist and textile, would rather present the best us we can be, and since the criteria nude has nothing to do with choice of clothing, style, and such, we tend to try and keep our skinsuit as well tailored as reasonably possible.
One of those newsreels did have a grossly overweight woman, laughing and having as much fun as anyone, and humorously mentioned that she was a bit unusual among the great majority of nudists, but none the less neither excluded, nor out of place in a nude environment. Nudism doesn't discriminate, even if some nudists do !
My own observations ( as well as documented research ) suggest that the vast majority ARE older, with the median age somewhere close to 50, but I've seen some "older" folks who are in GREAT shape ! My own observations do strongly suggest that keeping ones self "in shape" is far, far less popular today than before the Johnson administration, and that this seems true in both the textile world as well as ours.