why we die of old age ?

Old age :

Human is getting old from the beginning of their life. It starts from the day of birth. Infant child grew up, grew and reaches the age of adolescence. The organs the body become inactive when they getting old. Slowly this situation will leads to death(This is also known as a natural death).

A few changes that occur as your age increases: -

Brain and nervous system :

The number of neurons in the brain will reduce as their age increases. Many other organs help in filling this loss . Because of this brain may be active. Therefore, older people are going to do things a little slower. Take some time to understand what we say. As they grew old, forgetfulness of small words, forgetting small words and phrases, not able to learn new things, some of the words, names, names of places etc,. changes are noticed.

The number of cells in the spinal cord, above the age of 60 years is substantially lower. Loss of sense in older age may observed. So those old, have high chances of suffering with problems.

Immune system :

As age is increasing leads to declining in immunity. So they have high chances of effecting with cancer and pneumonia.