Hi, How long can an end stage dementia patient can live? She is 90 years old. She is eating food and drinking water well. But for every activities she needs help. Most of the time she do not open eyes and keep saying she is not well. Can not recognize anything or anyone. But when we give food she eats it. She use to urinate in bed so we are using diapers. She talks rarely. Always in a doz off state when waked up. Is also having pain around hips and taking medicines for that.