As far as I know, especially across Europe, the retirement age is increasing due to low birth rates and population ageing, the current pension system being unsustainable in this situation.
But this can't be a long term solution, because as people get older, their health deteriorates and they are unable to work anyway. I already see this phenomenon around me, as the retirement age reached 65. It is still not a very high percentage but let's say 1 in 10 (anecdotal) people retire before the legal age due to medical reasons. I can only conclude this will become more and more common as the retirement age heads towards 80. One can imagine a situation where the legal retirement age becomes irrelevant, as most people would be too sick to work by then anyway.
This can't be mitigated by increased life expectancy as some diseases, especially mental ones are more common as people age and most ones are incompatible with daily work.
Assuming current birth rates and population ageing keep their trend, is there any other solution for a sustainable retirement system?
How can European states have a sustainable retirement system since deteriorating health is associated with the increasing retirement age