Most people while you are working, save money in the retirement plan. So when they retire, they are just using the money they saved, not living out ot thin air.
In some jobs, old people can still contribute. But other jobs like that require a lot of physical strength are almost impossible.
An extreme case are sports. After some age, your body is just not good enough. Some can transition to being a coach or reporter. Some are only good at kicking a ball. If they are good enough to make millions of people happy, why can't they save some of the money they earn and have a nice life?
In some jobs, old people can still contribute. But other jobs like that require a lot of physical strength are almost impossible.
An extreme case are sports. After some age, your body is just not good enough. Some can transition to being a coach or reporter. Some are only good at kicking a ball. If they are good enough to make millions of people happy, why can't they save some of the money they earn and have a nice life?