We have two contributing factors to how we age:
Intrinsic Ageing, which is known as chronological Ageing, it is the inevitable genetically determined process that naturally occurs. It is out of our hands and something that is "In our genes." It counts for 50% of how we age.
Then we have Extrinsic Ageing, which counts for the other 50%. It is the part of Ageing that goes above and beyond genetics.
It involves lifestyle, environment, stress, diet, pollution, and lack of sleep. These are all factors that we can control.