Yeah I’m sure the older people who don’t want cellphones are going to love biking and walking everywhere.
That’s one of the main reasons that elderly people from the suburbs often move to retirement communities which are designed at pedestrian scale.
Walkable, bikeable cities are human cities.
(And they’re also the kind of cities that mobility aids like scooters can thrive in.)
Plus, look at the Netherlands, geriatric people who've biked their whole lives and maintained good physical shape have no problem continuing to bike.
For elderly people who have trouble pedaling, the answer is an e-bike.
Even for people lucky enough to live in those rare areas where you can walk to a grocery store, it's extremely useful to have access to a car you can fill up with large items.