The government pays for 70% of healthcare for working people. I.e. these are productive citizens (presumably) putting more into the system than they are getting

The government pays for 70% of healthcare for working people. I.e. these are productive citizens (presumably) putting more into the system than they are getting out of it, at ~72% (mathematically, that's 2.5 productive citizens per elderly). If the proportion rises to 40/60, that's a 1.5 citizen/elderly ratio. That itself is a huge concern.