I just googled ‘recumbent bicycles for seniors’. What I got was page after page of ads and descriptions of stationary recumbent exercise devices. I think this is beyond pathetic. A bicycle is not a stationary exercise device.
I ride a recumbent bicycle. I have done so for 15+ years and wish I had discovered recumbents years previously. I would have spent a lot more time riding.
From my experience I think a recumbent bicycle is at least one of the best if not the best exercise machines for seniors. A recumbent removes all the downside for seniors of ‘upright/diamond frame’ bikes, ie perineal (and for men prostrate) damage, wrist injury and the occasional over-the-bars stop to name a few. For those with balance problems there are recumbent trikes. Add a mid-drive electric motor to the cranks and you’ve got an exercise machine that will get most folks out and about for hours daily having a grand time and benefitting enormously healthwise.
In my humble opinion.