Yes to the alkaline diet comment, according to my western/eastern healer friends. For example, choose tangerines instead of oranges.
And the vegetarian diet idea seems good too, or at least go mostly organic. I am older than my picture would suggest & I think it's partly because of food choices. Organic food has surprisingly higher nutrient content, and that helps nourish the body, fight free radicals and make cells not work so hard.
The newest research I know about involves telomeres & taking supplements to stop the shortening of DNA. Just asked my friend to send a good link.