Why can't the old man see with his eyes and hear with his ears?

This is a series of diseases caused by physiological death and replacement of cells.

We know that most of anyone is made up of cells. In the beginning, anyone developed from a fertilized egg. After countless times of differentiation and division, the fertilized egg finally forms a complete individual. In all individuals, some cells need to be replaced every day, while some cells will only be replaced once every few decades or even hundreds of years. The process of people from young to old is actually the overall aging process of a cell, that is, the overall aging of cells will make the outside grow some characteristics that only the elderly have, such as white hair and more wrinkles on the skin, which are all caused by the overall aging of cells.

Of course, the cells related to eyes and ears will have a similar situation. After working for decades, some cells begin to age gradually, and then gradually communicate after falling, that is, cell death. At this time, other cells are not dead, and the pressure is even greater, just like ten people sharing a job. Two people died at this time, so eight people should do their previous work well, which will make the old man feel better.

Aging is a complete process, not only eyes and ears, but also other parts of the body will gradually age. For example, I read a data before, and the life cycle of memory cells in the brain is 106, which means that after 106, most people will forget the previous events because they will gradually die.

Of course, this is also a warning. We should pay attention to maintaining our bodies at ordinary times, so that our cells can live more moist, moist and natural, and live longer. The longer they live, the longer we will live as a whole.