If person had dementia and care taker did not get treated for years will this shorten life?

Question

yes untreated  dementia in this old age obviously shortening life, he have to be eneurraged to stay long in the world, give her nutrius food and drink as she gets strength and vitality, give also nerve strengthen vitamins alone with more vegetables and fruit juice,and diet in time 
god bless her for long healthy life

Suhas Chandra Nayak · Accepted Answer

yes untreated  dementia in this old age obviously shortening life, he have to be eneurraged to stay long in the world, give her nutrius food and drink as she gets strength and vitality, give also nerve strengthen vitamins alone with more vegetables and fruit juice,and diet in time 
god bless her for long healthy life

Himanshu Vats · Answer

No one knows exactly how much life we are going to live so there is no particular way to say whether a particular person's life is shortened because of a particular event in life. For example, some say smoking reduces life by causing lung cancer, wherein there are plenty such cases where nonsmokers died because of it and smokers lived longer. The data that we see only finds averages and means but has no absolute way of making a sure-shot statement. 
The day starts with you waking up. So whenever the caretaker realizes that the cared has dementia, he/she should help her with the treatment by looking forward and not backward.
Take care :)