Is There A Table To Calculate The Life Expectancy Of My Mother With Alzheimer's Disease?

My mother was diagnosed with Alzheimer's at age 79 and is now turning 86 years old. She also has mitral valve prolapse, atrial fibrulation and diabetes. The heart issues were as a result of contracting scarlet fever as an 11 year old. The diabetes is fully controlled with a proper diet only; she was diagnosed while still living alone and eating horribly. She never smoked or drank alcohol, but my father was a smoker and died at age 54. She was married for 27 years and inhaled 2nd hand smoke during that time. She was 1 of 12 children; all of her siblings have died of either heart disease or cancer. None of them lived past 81 years of age. She's approx. 5 ft and weighs 145lbs., but was obese most of her married life. She attends a senior daycare facility 4 times a week and gets exercise there, social activity and mental stimulation. Is there a table to calculate her life expectancy with those conditions?