to have memory like a sieve
to have a senior moment
be etched on someone's mind
to lose your train of thought
to go in one ear and out the other
to jog someone's memory
in your mind's eye
to take a trip down memory lane
to be extremely forgetful
The day my son was born is just ...
When you help someone to remember something they have forgotten, you ...
To reminisce over memories of past events, especially happy ones
In... , she is still a little girl of six, although she's actually a grown woman
to be distracted
to feel embarrassed because of not being able to remember sth obvious
to ignore or quickly forget what you've heard