When you have things at walk distance you don't need to buy 40 pounds of groceries. That's a US suburban problem.

70 year old people are exactly those who already walk to the next shop multiple times a week. You should keep in mind that this article is from Europe. Its walking short distances and even shorter shopping lists.

I am not sure you should be driving a car at seventy if you're not able to ride a bike anymore despite a livetime of experience. (and you can get bikes for various disabilities, yes)

My mother is seventy one and rides a cargo tricycle to the supermarket. She can't drive so in an American city she would have to order her groceries, I guess.

Elderly people are often helped the most this type of change. People who can no longer drive can still get around by other means. My grandfather had a tricycle that he rode for many years after he became incapable of driving a car.

If all you're getting is dinner that's only a couple pounds tops. But I walk. Cycling wouldn't be difficult at all.