I think we all have different memory abilities (my stepmother didn't remember things about our life when I was younger either as she got older) and problems and, also, we all remember best things about ourselves. Something that is intense to us, the other person doesn't feel the intensity because it is not happening to them so literally is not "important" to them in the same way it is to us. What I am finding at 60 years old, too, I use to remember everything, as you seem to do now, but no longer do. The older you get the more there is to remember so one gets more selective in what one does remember, I think. A lot depends on one's focus; in therapy I was focused on myself and my past but once I resolved a lot of my issues in therapy, I didn't need to remember those memories in quite the detail or at all.