I remember seeing a video clip of a news story about this old lady. I'm sorry to hear that she has to stop driving.
Frankly, whoever isn't happy driving their car should get a different car if they are real 'drivers' and not just 'commuters'. Personally, I think I spend too much time in my car to not be happy while driving it.
Mercedes Diesels (like the 240D or 300D) are pretty well known for going over 1 million miles (they are a common 'Taxi' car in Germany).
That 'guy' with the Volvo is 'Irv Gordon' (I live on Long Island, as he does and we belong to some of the same groups). And if anyone would like, I have a 1965 Volvo 1800 for sale that is similar to the same car he has (of course, with much less mileage on it ATM).
1993 Pontiac Bonneville (daily driver)
1988 VW Jetta (registered and insured, just not ready to take over as DD yet)
1972 1800E (Parts car)
1972 1800ES (almost done with dis-assembly, going for bodywork and then getting new engine (performance) just before paint)
1965 1800S (it found me. Bought from the Original Owners wife. I really need to sell this car before it takes resources away from my other projects)