Well, then, it shouldn't be right outside my window either according to that website.
My neighbors in a previous home had a portable generator that they would hookup and operate in the garage with the garage door open.
Then your former neighbors are danged lucky to be alive. Fuel-fed generators with motors (the noisy ones) generate carbon monoxide; they need generous ventilation space, and should never be used under a roof. (However, you are correct that they also should never be near a window into a dwelling; unless you built your house after theirs, you could probably sue to make them move it away from your home.)
Underground cables are irrelevant in terms of the need for generators in Florida; in the case of a hurricane strike, whole counties lose power for weeks on end if the power stations or primary transmission towers are knocked out, which they usually are. One solution that has become very popular in hurricane zones now is not a generator but a backup battery fed by rooftop solar panels; the Tesla PowerWall is the most popular. Powerwalls can used without solar panels as well; they can also store energy taken from the grid. If you think this is a possibility that you might want to consider, even if you don't install it now, I'd think about reinforcing the roof to take the weight of solar panels, and also wiring connections for panels and a whole-house battery while the walls are still exposed. (Note to the OP, if you are considering ever adding solar, and your new home is served by Florida Power & Light, read up on the current Florida Power & Light proposal making its way through the Florida legislature. If passed, it will have major ramifications for residential solar energy.) I'd also, as a PP suggested, add vehicle plug-in outlets to your garage, just in case. If nothing else, they may be helpful when the house is eventually sold.
I would also agree about designing the home as much as possible to accommodate aging-in-place; though there is no need to trick it out like a nursing home with grab bars all over the place just yet, but as a PP also noted, adding in wall structure and anchors with sufficient strength for them will likely save you a lot of aggravation later. If you don't like the higher toilets, know that toilet-height booster rings are cheap and easy to slip into place when needed, but many people consider them unsightly; things to think about. Do put lever handles instead of knobs on all your doors, though; that's just good design. And try to eliminate raised thresholds wherever you can; my MIL stopped coming to our home for the final 5 years of her life because she could not comfortably navigate the 3-inch step from the walkway to the house, and she HATED being assisted over it.
PPs have noted quite a lot of the aging-in-place issues, so I won't repeat; but one topic that I have not seen mentioned is contrast in kitchen/bath design. As we age, our ability to judge depth-of-field in similar-color backgrounds decreases a LOT. What that means in practice is that older people frequently have more problems with falls, spills, and container breakage in kitchens/baths that have floors, walls, and countertops done in the same/similar color, because they cannot clearly discern the demarcation between horizontal and vertical surfaces. This causes accidents such as burns from missing the edge of a stove when setting down a hot pot, because the color of the cooktop, the countertop, the cabinet fronts, and the color of the floor below it are nearly the same. Designing your kitchen and bath so that there is the highest color contrast you are comfortable with between adjacent horizontal/vertical surfaces adds considerably to safety. (However, you don't want to create contrast in your floor colors between rooms; that can lead to falls because of a perceived step where none actually exists.) This site has a nice summary of most of the design issues related to visual acuity:
Aging in Place: Stylish, Affordable Ways to Make Your Home Safer | Bottom Line Inc
PS: One rather cool little feature I saw recently might be great for someone older: a fireproof pass-through door from the garage to the pantry, if they share a wall. Where feasible, it lets you drastically shorten the distance that groceries need to be carried.