No one’s memory is perfect, but some medical conditions can cause more difficulty with memory than is usual.
Short-term (new) memories are more likely to be affected than long-term (old) memories. Someone may not remember something that happened that morning but may remember very clearly something that happened years ago.
People tend to forget everyday things that are relatively unimportant, like posting letters or appointment times.
Anxiety and stress affect memory, so worrying may make it even harder to remember.
Trying to ‘exercise’ the memory by setting yourself memory tests is rarely useful. It is better to keep your brain active by continuing to do the things you enjoy.