I'm not much for clairvoyance, but due to the wholly ridiculous amount of time I spent playing the game (often near-totally immersed in terms of emotion and concentration, plus on occasion also sleep-deprived or semi-conscious due to exhaustion), as time passes my memories of playing become progressively less "virtual" and blend with recollections of real life.
I have a very good and vivid memory and when I think back to certain specific examples of playing the game my imagination tends to fill in the sensory gaps (touch, smell, heat, wind speed/direction, etc) and the results are memories more like half-recalled dreams of me actually doing the things my character did, rather than memories of sitting at a computer staring at a pixellated screen.
I'm confident that by the time I'm sixty I'll swear blind that I really did once jump down an ancient stone abyss into a vast, breathtaking cavern of pink crystals to fight an immortal wizard surrounded by demons.
For our generation, dementia is going to be absolutely mind-blowing for the poor young nurses charged with keeping us entertained. "Yes dear. Yes. You collected all the exploration badges in the hospital and got the accolade. Now let me take you back to bed or you'll miss Sally spawning in the morning..."