It is not only older people who misplace some things and then have to go on a time-consuming search again and again. There are a few ways to counteract this:
The first step to change is to act consciously, i.e. when you misplace your key or wallet, you should also consciously say goodbye to it, because in this way you store in your memory more consciously where and when you put something down. The best method, however, is still to assign a fixed storage location to such everyday objects, whereby this location should be very obvious, especially at the beginning, when you still have to memorise it. For example, you can choose a conspicuous bowl on a windowsill near the front door for the house key or the car key and papers.