Hello @manisha.jain9, it is true that aging is not truely understood due to the fact that people of the same age may not look outwardly the same. Some gets older in physique than their mates. That may be as a result of how we take care of our body.

Accepting the fact that you will become old gives you hope and confidence in life and not fear. So when you start now to take the necessary nutrients, it will boost your immune system, there by preparing you for old age. Exercise also is another way that helps in slowing down aging.
Wish you success in the contest