Septimia what disposable income do you think people have? You are right that in the case of a pensioner pensions are, after a short period, and let's say it how it is, not "adjusted" but decreased. During this time the bills on your home and the possible living costs of a partner are still having to be paid.
If fact, Pensioners are the only people who, at this point in time, are charged a "board and lodging". I remember my father being terrified of staying in the hospital for too long and that this would kick in and they had small work pensions to help. The additional stress of losing this money can be huge. I think it is iniquitous.
In the period 2015/16 to 2017/18, single pensioners in the UK had an average income of £216 per week. That is £11,232 and it is average. Older pensioners averages are lower than younger ones and they are the most likely to be in a hospital. Those who only have the state pension only should not be getting less than £8,767 and you want to charge them out of this?