No one would ever think that aging is a disease, aging is natural. Your thoughts about aging starting from 25-35 is a nice thought.

This is the age that one should start preparing for old age by strengthening the immune system through eating healthy diet and exercising.

It is true that daily intake of nutrients along with physical and mental positivity prevent aging. Omega 3 fatty acid smoothens our skin thereby preventing aging.
I wish you good luck in your contest