Dementia to old people is very sad because they cannot recognize anybody including their family members. To them, it may not be too sad since they are senseless in their brain, but to the family members, it is really something they cannot accept in their daily life.
Dementia mostly appeared at the age of over seventy. Age at sixty is rare to happen up to now. Medical scientists cannot find out what is the reason to cause dementia. So far, no medicine can cure this illness. The sick person, once dementia falls upon him, can never be recovered by himself. He will be dementia forever until he dies.
Our life depends on our heart to live on. Without the function of heart, we die immediately. But, dementia is different, the patient can still live for many years if he or she can be well taken-care by others.
But, to the patient, the life is meaningless. He has only a human body without sense, without soul. He is a useless thing to his family and to the society. But, what we can do is and due to a human relationship, we have to feed him as long as he can breathe.
Therefore we can only take care by ourselves to prevent such terrible illness. That is to eat more vegetables, less meat, to avoid blockade in our blood vessels. We should have knowledge to save ourselves by ourselves.