For the last 100 years, the period of life of very elderly has increased, especially in industrially developed countries.
We have learned how to struggle with diseases which were considered as incurable earlier. There were new drugs. The education level of people has grown, we understand more what is “healthy lifestyle” mean. We have a developed system of social help to older adults.
Adults gradually grow older. They become physically helpless. Their sight and hearing worsen, the physical mobility vanishes, serious physiological and mental diseases develop.
The risk of emergence of such diseases as atherosclerosis, cancer, cerebral and vascular diseases increases. Some people may develop Alzheimer condition and dementia.