Is there any further information on this? The fact sheet has a bit of a gap in the ages... it gives a range for "younger" sufferers, and then for ones in their 90s. My OH was diagnosed with AD in 2012, tho I am sure it started two or three years previously. He was 79 when diagnosed, and will be 82 next month. Mobility not the best, possibly because of Parkinsons, we dont know yet, and cognitive impairment the worst manifestation. Sounds silly, but research and thinking ahead keeps me sane... though I have no idea what difference even a definite answer to this "how long is a piece of string" question would make!