Why can’t they? See my post above. From 2032 onwards the number of pensioners should be falling, and life expectancy has already stopped increasing. The changes made increasing the pension age to 67 were calculated using numbers which haven’t changed. Indeed, since the Cridland report (on which the pension age increases were based), projected costs have already started to fall. And finally, we already have the triple lock, and costs can be reduced by reigning that in; I’m sure most of us would rather lose the third lock, rather than work to 75. The idea that pension costs are destined to continue increasing forever is a myth.