I think inflation is a big challenge when it's very high, and it hits vulnerable people more than other people because they're already struggling and inflation just exacerbates the problems. In my country, the elderly are a big social group, and also a very vulnerable one (with a higher poverty rate than average). So yeah, inflation is a challenge for them, and considering that the Pension Fund is getting smaller, it will be an even bigger challenge in 10–20 years, unless we figure out how to improve the overall economic situation and the pension situation specifically. But that all can be different in another country.
the only way is to repurpose that pension fund through investment where it might yield enough to overcome inflation, just remember at the time of pandemic the inflation is really overwhelming even the effect still can be felt until today where the price of commodity and basic needs are sky rocketing and it never come down even after the pandemic itself is finally coming to an end.
inflation will really affect those pension fund that just being kept not reinvested but knowing that even investing might not be the best idea because inherent risk carried also something need to be taken into account too.
there's just really no solution yet to overcome this problem, elderly people are the ones that actually really in need of money aside from fulfilling their basic need such as food and clothing the elderly people are also have their share of problems too, hopefully though there will be solution to this, otherwise the pension fund worth will just get smaller and smaller over the course of the year.