My father had to give up riding a bicycle because he could no longer balance, so I am also looking at recumbent trikes. These also have the advantage of a seat rather than a saddle, so are a possible solution if I get serious prostate problems as I get older. And they can have electrical assistance if necessary. A local bike shop has a recumbent available for hire, so I may try it.
I find it easier to balance on the bike than on foot. I had a semi-recumbent for a short period and didn't feel too confident on it because it was too low in relation to the preponderance of SUVs and upright people-carriers on the roads here; my normal everyday bike puts my head above the roof of a Range Rover, which makes me not only visible but threatening to motorists, not a bad thing at all. I later looked seriously into buying another semi-recumbent but Utopia stopped making it before I made up my mind; this would been restricted to the smallest lanes hereabouts where I know all the motorists and they expect to see me. I had a Revelo/Cheeko90 seat bought in Holland rather than a saddle on my fully automatic Trek Smover, basically a mountain bike with luxury fittings, and it was superb for comfort, though its lifespan was not much chop in the perspective of how long a Brooks leather saddle lasts.
If/when I get to the stage where I haven't enough strength to use an ordinary bike I will certainly consider an ebike.
An ebike with a worthwhile battery is heavy. You can use the motor to get you going, especially in traffic where slow-speed wobbles may be dangerous, but there is still the moment when you have to tilt the bike to get your leg over, and then raise it again to an upright position. That is actually the worst thing about an ebike, because once you're moving the motor can be cut in and out at will (given that you buy a bike or kit with decent controls) to overcome virtually any disability short of passing out and falling off your bike.
In general, I would say that the practicalities of what you can and cannot do with an e-bike are nothing like you imagined they would be, even if you're a long time pedal cyclist. I was fortunate that when i first bought an electric kit, it was to overcome a specific hill after impending heart surgery, so I grew into its other abilities (supports?) gradually as they were required, and thus came to be at one with the thing by almost imperceptible steps. Also, I was long, long used to regulating my output on pedal-only bikes by my heart rate (rather than by cadence), so the electric motor fitted seamlessly into established exercise routines. As a result of my own experience, I'd advise you, before it becomes absolutely necessary, to electrify one of your bikes (or buy an e-bike used) and ride it occasionally simply to understand how you will use it as a utility vehicle, for exercise, for recreation, or whatever you do, so that when you do need it, your life can carry on smoothly, the change to ebike as your main bike hardly noticed. One important thing, if you often ride with companions, as I do, is to learn to keep pace with unelectrified cyclists without stressing you or them out; I fortunately learned that gradually before it became a pressure point where you suddenly have to learn something when your attention is already divided by new circumstances.
