That's not true. Old people often need expensive support and may not be able to work as productively as they once did. If the population ages, the relative amount we spend on medical bills will go up and productivity will go down.
On the whole you might think it's not worth it. That doesn't mean there's no benefit whatsoever.
https://plato.stanford.edu/entries/repugnant-conclusion
>no societal problems are solved by adding more
That's not true. Old people often need expensive support and may not be able to work as productively as they once did. If the population ages, the relative amount we spend on medical bills will go up and productivity will go down.
On the whole you might think it's not worth it. That doesn't mean there's no benefit whatsoever.