Bah, my 80+ year-old mother had one of the first Model 3's in Vegas, so been driving it for about 2.5 years now. It's fine, you don't need to be tech-savvy to just drive a Tesla, at the end of the day it drives like a car. I was with the for the first three days, and 50% of it was just getting used to the driving style of a different car - turn radius, acceleration and braking, blind spots. That said I think I set her profile to Chill, Low Regen, Creep Mode on in the beginning to better mimic a typical automatic Honda, and it may still be set that way - but now that she's used to the car, I'm sure she'd be able to have those settings changed without issue. She and my even older father also made one 1500+ mile road trip through the desert to visit me with no issues, Superchargers and all.
Here are the main pluses and minuses that I think might matter pertinent to their age:
-power and acceleration - as others did mention, there is a lot more here than might be safe. I do think one gets used to it, but again I did set it to Chill initially.
-Creep mode - at a stop is the car is more like a manual than automatic, she was letting her foot off the brake at some stops because an automatic will keep the car still on an upslope. So the Model 3 was slowly rolling backward at a few stops without her really noticing. I'm sure she would've adapted without the Creep mode soon enough though.
-Autopilot - I ordered EAP at the time, because her main interest was having the car do the lane changes more safely for her, and I do think it will do that. That being said, in the first days she was gripping the wheel so hard she was pulling the car out of Autopilot very easily. She did say she doesn't really use Autopilot lanekeeping anymore, only the TACC (cruise control) - but I think as she gets older it may keep her able to safely drive for much longer)
-not pumping gas. She hates pumping her own gas, so this is great. I had a 14-50 put in at home, and plugging in every night was easy to learn, just had to learn to push it in firmly (first few times it charged at half amperage because it wasn't in fully)
-low seats - I can see it is a bit difficult for my dad to get in and out because the seats are pretty low to the ground, but I'm sure he's figure out the easiest way to get in and out.
-Superchargers - the issue is, she doesn't parallel park or back into parking spots anymore, and most Superchargers require you to back in. At home, she never needs to Supercharge. I figured on road trips, other friendly Tesla drivers would back the car in if they needed help. They managed fine on their one road trip, esp most Superchargers on road trips are not that crowded, so they picked ones that had empty stalls alongside and backed in OK.
-24-hr monitoring - using a third-party logger, I can keep track of where they are, when they charge, 24x7. That's reassuring to make sure they're never stuck, and to be able to direct help if they ever are. I even sent directions and destinations to their car in realtime from my phone's Google maps while they were in the middle of their road trip, for example to point them to a Supercharger more optimal for their route.