I have a confession to make..
.. Sometimes my memory is too good, I surprise myself!
I don't know when it started. I could have had it in me ever since (as if) but then I would have to say it is not in all areas. I am bad at trying to remember what I wore last week, or what I ate yesterday for breakfast, or that an old good friend had a mole in between her mouth and chin. Ordinarily I don't remember these details. There are a few funny stories about my memory lapse on these instances. I actually told that my friend (with the mole) that she had some dirt on her chin!!! I was embarrassed by this! Another instance I told my colleague she had dirt on her cheek! She said it was a permanent scar/scratch of some sort. I would say it so casually that I just forgot that I HAVE seen them (mole and scar) before!
But with travel, it is quite different. With airport and city codes and computer entries, and geography and maps, capital cities, etc. I have quite a good memory. I also am a bit quite good at memorising telephone numbers, passenger details, etc. I guess it's what is called selective memory?