There's a lot of old people in SF who struggle to even walk to the end of a block for a bus stop. A society still needs some solution for picking Grandma up at her door and dropping her off at Thanksgiving.
I said "most people" won't need cars. I think you'd agree that most people do not struggle to walk short distances.
Incredibly there are countries in the world which are not car centric where people have infirm grandparents.
I wonder what the impact of reduced car ownership is on increased mobility in the elderly population. It wouldn't surprise me if this was correlated.
For one obvious example, the people who legitimately need to rely on cars will spend less time sitting in traffic.
Often the elderly live with family so they are much better attended overall than most in the U.S., and wouldn't need to pick up their own prescriptions themselves in the first place.