As regards 50+ vs "older rider" I much prefer 50+. We had a lot of discussion about this when we started the forum. "Older" is a non-defined term which could be anywhere from 25 to 80, depending upon the reader's viewpoint. 50+ has a real meaning.
Many forums have some sort of a sticky about choosing a bike, etc. I.e., the Clydesdale forum has special info for heavier and larger riders.
So, let's not try to do a "be all" thing, but instead the special things aimed at 50+'rs.
Good job, Cat