Just using my SELF as an example of the aging process, I am blood type O positive.  There are characteristics of blood types and which foods and nutrients make YOUR body age best.  So if you do not know your blood type, Dr. D’Amato has a little kit you can order and find out your blood type.
YOUR body will work best when you feed it the best things for it.  My body runs best  on a high-protein, low-carb diet , but that is my body.  YOUR body is different and may run best on high carb or other things.
I make sure when I buy protein powder that I get quality protein powder.  Whatever you put into your body you are doing research on quality.  I buy from a locally owned pharmacy who has  pharmacists who are also registered, nutritionists.