The information on the page seems pretty old. 1979 is 40 years ago. I can’t find many recent papers either.
However, so far I still show the signs of eidetic memory. What they describe does sound a lot how I experience my visual memory. When I recall an image of something I see it in front of me and with the right colors and like I said before, I can remember them for a very long time, sometimes much longer than a couple of minutes. When I was learning math, I remembered the equations for days before I wrote them down in my notebook. When I recall something I only see an image, I don’t know what it is like otherwise. Even when I do mental calculations I see the numbers vividly. I often don’t see what is in front of me because I only see the numbers and I can manipulate them like you would on a paper.
I hope I can get checked out because I am still not certain about anything. It would be interesting if I do have an eidetic memory because I am an adult, I don’t think I am going to lose it since I am already 21.