Let me try to put my point another way.

Given the demographic shift of an ageing population and the older members of the population living longer than ever before, there are few options if we want to maintain our aspirations of a "retirement life".

The obvious way is to accept that we have to make provision for a lot more workers to maintain us. That is to accept much greater immigration rates.

If we consider that large scale immigration and population growth is undesirable then it follows that we must give up pretty much all our expectations of "retirement". With fewer earners the only answer is to reduce the number of dependants. I presume that nobody here is proposing a cull of the elderly, so would those people concerned about immigration be totally willing to continue to work to support themselves - in effect - until they die or become wholly incapable?