Have 3 of the requirements for Recumbents- Age-Grey Hair and Beard and I am working on the belly- but I have tried them and not for me. But also didn't mention Mountain bikes or Tandems- both of which I also ride. I tried to keep it to a general bike and what I said above will be the same for any bike ( Not certain about Unicycles though)

And BD is right-Right bike for the type of riding you do and that is about it. But I would worry about the colour. One of my neighbours went out and parked his white bike down in the Forest at the weekend- He lost it and will have to wait till the snow melts before he can find it.