"As one gets older, it happens that in the morning one fails to remember the airplane trip to be taken in a few hours or the lecture scheduled for the afternoon"

This quote by Rudolf Arnheim talks to the reality of aging and the effects it can have on our memories. As we age, our memories can end up being less reputable and we might find ourselves forgetting important information. In this quote, Arnheim is suggesting that as we age, we may find ourselves forgetting things like an upcoming aircraft trip or a lecture we are arranged to go to. This can be a source of aggravation and anxiety, as we may stress that we will miss out on something essential. However, Arnheim is also recommending that this is a normal part of aging which we should not be too difficult on ourselves if we forget something. Instead, we ought to take steps to make sure that we are ready and organized, so that we can lessen the opportunities of forgetting something crucial.