I rode to a rally in Indiana last month (the ABATE Boogie - highly recommended if you like nudity and good music, BTW), and rode from there to Cincinatti with a lovely woman (56 also) named Cathy, who was something of a biker hippie type (bored out Sportster 883, chromed tank, very cool) from Oregon, and a really nice person. At a rest area where we stopped to take a breather, she told me "old guys are so cool". Age is just a number, man.
So, unseemly at 56? I don't think so.