Independence
One of the most important things for any human being, is being able to be independent. Sometimes, it's better to let an older person struggle with a simple task over doing it for them. One example of such would be sorting the dishes out of the dishwasher. A simple task that will become challenging after a certain age. Allowing them to continue doing these tasks will give them a sense of dignity.
Also, not doing anything will cause a body to deteriorate much faster.