Capitalism is growth based. It requires infinite growth in order to operate normally, and we are on a finite planet.

I see your point but for "academic reasons", is there any proof of this claim.

Nothing within socialism points to growth of any kind, and well-structured socialism can even function well under degrowth conditions.

have to disagree strongly.

• Older individuals needs help from the socity in order to survive and have goods like clothes and so on.
• The help in questions has to be provided my at least middle aged individuals. They must spend resources like money, energy etc. on it.
• If you have significant more older individuals than younger ones, you got a really problem with the resources.

Even a socialistic society has to follow this logic since their resources, like the workforce of younger people, are limited.

The situation we'll face in the near future, the situation of having more and more older individuals, while we need resources for a lot of other fields like AI, political stuff and clima, would be problem in any human society. In every society which suffer the problem of limited resources.