I found this (somewhere on the web) to be informative for anyone else dealing with dementia caretaking. Stage one: normal adult with no functional decline. Stage two: age associated memory impairment with personal awareness of some functional decline. Stage three: mild cognitive impairment with noticeable deficits in demanding job situations. Stage four: mild dementia with requiring assistance in complicated tasks. Stage five: moderate dementia with requiring assistance in choosing proper attire. Stage six: moderately severe dementia with requiring assistance dressing, bathing and toileting. Stage seven: severe dementia with speech ability declines to about half dozens intelligible words. I feel my mother in law is 64 and is already somewhere in between stage 4 and 5. Her PET Scan did confirm frontal lobe shrinkage.