Many 70+ yr olds cannot or should not be driving cars either, because of eyesight/reflexes. Bicycles on the other hand, especially if conditioned throughout life, and later Trikes/Handbikes/Recumbents can be great options for many elders, and cycle infrastructure is perfectly usable for mobility scooters etc for those who really can’t or do not want to bike.
Ride Bike 5-10k to train station, take train for an hour or two with bike, ride Bike 5-10k to my parents house. I do it once or twice a month.