You need to bear in mind that this guff about people living longer is the problem, it isn't. The problem is, successive governments changing the laws and rules to access NI contributions and use it as a taxation.
NI was supposed to fund pensions as well as social security and the NHS.
They've used the contributions to cover tax breaks for those that don't need it and offset corporation taxes that aren't being paid at all.
We're one of the lowest pensions in the West and nowhere near a liveable income. So, sod off basically