In answer to the original question: No, no one over 50 rides a recumbent. No, wait a minute, I mean no one under 50 rides one. I ride one and can't believe that I am over 50. Or 60.
Went on a club ride today and out of about a hundred cyclists, I had the only 'bent. Sometimes it seems as if no one but me rides them.
My legs hurt after riding today but I can't blame the bike - I blame the danged Southern Indiana hills, many of which point up.