I could imagine safety features, as part of the car's OS, such as: "if grandma wants to go somewhere, take her for a 10 minute ride around town and return home".

On the other hand, nostalgists might keep them occupied.

"The nostalgist is an interior designer specializing in recreating memories for retired people. Rather than settling for a typical ‘retirement village’ experience where everyone’s apartment looks the same, the wealthy elderly of 2030 will have the luxury of living in a space inspired by their favourite decade. Nostalgists recreate the setting of their preferred time and place for seniors wishing to relive their past, from a small-town 1970s living room to a 1980s university dorm room."