How many years does someone suffer from Alzheimer's Disease once diagnosed?

My dad is 73, he was diagnosed at 66. Currently he is living at Luvida Care Solutions, it has been 7 years since the diagnosis and he is doing fine.

My Mom lived in a locked unit with many others that had the Alzheimer's. From what I saw the younger they were when they got it, the quicker it progressed. My mother was diagnosed at 63, and was dead by 71. There were people there that were diagnosed later in life that lasted much longer than her. I think like everything else with aging, the older you get the slower things progress. As Cheryl said, this is just my experience.

I'm sure there are some medical people that may give you that can provide an educated answer. My observational experience is about 8-10 years. Those that have it noticeably in their 50s seem to barely get to their 60th. My MIL was around 77 when it became noticeable and just passed one month before her 86th b-day. But this is just my experience.