What will happen to old electric car batteries?

When we are all forced to go electric for new cars the batteries will not last forever, so what has been decided what happens with all the old car batteries?

What's the life span of a battery in an EV?

I am becoming more interested in purchasing an electric car and at the age of 72 and a low mileage driver want it to last a long time. I imagine that the battery in an electric car is a lot different from...