> work until 68 instead of 65

That’s the thing about pension schemes like American social security: they were originally set with a retirement age that matched mean mortality, so half of potential recipients would die before drawing on them. In other words, half of workers were not meant to retire, and the half that did would be protected by the contributions of all. Modern medicine completely changed those expectations, keeping the elderly alive twenty years longer and making twenty years of unproductive, publicly funded retirement an expectation and entitlement for everyone. It’s political suicide to discuss whether something should change about that.