It seems to me that there should be some kind of compromise - a person PAYS TAXES FOR ALL LIFE. And there should be some kind of agreement where the conditions cannot be changed. If the state takes money from you in the form of taxes and uses it ineptly, which leads to distortions in the economy, then you should not violate the retirement period, but look for solutions, but not at the expense of those who have already paid, and counted on pension payments in a certain age. Then the taxpayer should also have a mechanism for reviewing relations. For example - you raised the retirement age by 10% - give me back 10% of all taxes I paid, plus the interest rate for using my money for this period, which I counted on but was deceived.
While this seems fair, they're not going to give you back anything. It's the government that we're talking about. They can only take and whatever they "give" is their way of buying votes.
If they're mismanaging the retirement money they shouldn't put the blame on people, especially those older ones who worked for more than 20 years, just to find out they're going to have to work much more than they thought to get what was promised. They should make the change gradually, with the ones closest to retirement not having to take the burden.
It would've been best if the retirement was a choice. You retire at whatever age you like and that age decides the amount of money you'll receive as pension.