Why do we get old? (4)

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Why do we get old?
What are the mitochondrial damage and free radical damage?
Why do human age? Some elders are still healthy, but some are weak and sick. The scientists do not come to the definitive conclusions yet. There are some aging theories as the following.   

 The aging theories_part4

Mitochondrial damage
Mitochondrial DNA converts chemical energy from food into cells. It maintains our daily life and repairs the damaged cells. As time goes by, mitochondrial DNA will be damaged such as the influence of environment, binge eating, etc. But it will not be so easy to repair as young age.Then the body will be out of the frying pan and into the fire.

Free radical damage
A free radical is any atom or molecule that has a single unpaired electron in an outer shell. The free radical is unstable, and it will tend to catch an electron from the other atom or molecule. When it catches an electron, it will affect the function of the original tissue or cells. If the original molecule is DNA, it will affect its function, even mutation. Property of DNA is that it can replicate or duplicate by itself. It is the hereditary material in humans and organisms. 

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