I'm mid fifties and can handle the 3.4 setup by myself. Your best bet would be an airdeck around 3 / 3.2m with the 9.8hp Tohatsu 2 stroke. It'll be light enough to handle, give you enough room for one and fishing gear and have enough power to get you out of trouble.
Also how far from your launch site are you? I'm only a few hundred yards away so I just pull my boat along on the transom wheels. My mate on the other hand lives several miles away. He's in in sixties and has a similar setup to the above. He keeps his sib inflated on a trailer, drives to the launch site, then uses the transom wheels.
Everyone's different, I'm sure others will have their own ideas on the ideal setup for one.