What does "reduce pensions" mean? Pensions are people's property. You can take pensions like you can confiscate property, a la communism.
1. A state provided welfare benefit Or 2. A privately held long term savings/investment account
Would not be very motivational if you work hard your whole life and then you are considered a useless burden once you retire.
The way it usually works is taxation from the current working generation pays for the current retirees. You are not paying into your own account for later (that is a private pension)
FWIW in the UK there are more children in poverty (so their parents too) than retirees who are in poverty. Kids don't vote though...
What's annoying about these debates is that the people who'd e.g. like to see pension cuts are either young and will change their mind later, or they are so rich that none of this matters to them anyway and the latter shouldn't even have a voice in this debate.
The issue is the "triple lock" (state pension rises by whichever is higher of either rate of inflation, average earnings increases, or 2.5%).
While laudable in intent, recently this has led to situations where pensioners are getting bumper increases linked to high inflation, while the younger working age people are getting stagnant wages while inflation shoots up.
This is is why pensioners are on average getting wealthier than the working population. Let that settle in for a moment: year after year pensioners are getting more wealthy than the working population that is financing the pensioner's increase in wealth.
This is universally accepted as unsustainable and deeply unfair on an intergenerational basis as the pensioners - who generally tend to own their own homes and also get various benefits like free transport and extra money for heating costs etc as well as benefiting from more generous policies/working conditions of the past like free university education and final-salary private pensions or purchasing government-built social housing at steeply-discounted rates, lower tax burden - continue to get more and more well-off while the people financing their retirement are struggling with soaring costs, expensive childcare, high education costs, zero-hour contracts, stagnant wages and all the rest.
Yet pensioners complain that they paid their taxes "all their lives" so they deserve to continue getting a bigger and bigger slice of the pie, that they deserve to get wealthier and wealthier than the working population, all at the cost of pushing more children below the poverty line and financially crippling the current workers who have also paid their taxes all their lives (so far).
Eventually with policies like these, you run out of other people's money.
Trouble is that it is a political landmine since pensioners are a big part of the vote so no one has the balls to abolish (or at least reform) the triple lock.
It's mysterious why they haven't done that despite the fact that the demographic problems were known to occur up to 40 years ago. But you see the same thing with housing prices and rents, forthcoming problems were already obvious 20 years ago in every country, yet only few have tried to deal with them in time. Maybe someone else can explain where this inertia comes from, I always found it strange.
Because it goes against their personal interests.
I don't know how this works in other countries. In Finland, it was established decades ago that pensions based on past contributions are constitutionally protected private property. Because people made explicit pension contributions and because the government promised that the future pension would be based on the individual contributions, the government can't alter the deal substantially without a constitutional amendment. If the contributions had been general taxes, or if the promised pension had been independent of the actual contributions, ordinary legislative process would have been enough.