Replying to Memories becoming less vivid

My memories all have started to become less vivid. Ill try my best to explain it... Recently when i think of what i have done lately (like at the end of the day for example) I can remember what I did, but everything has become less clear when i try to think of it. When i was younger my memories were photographic, i could remember a lot of details. Im just wondering if anyone knows of this happening, or self experience. I think it could be from me just getting older and busier, or my eyesight becoming worse. I have Dysthymia (chronic depression) and that could be a possible cause, but i doubt it. Not a very entertaining thread for you all, but just wondering if this has happened to any of you