I am a 70 year old woman. I take yoga classes on a regular basis, take daily walks and have a meditation practice. I consume a mostly plant based diet and stay away from processed foods. I have osteoporosis, arthritis and although I eat little sugar my a1c puts me in the pre- diabetic range. I have always had a poor memory, and worry about age related memory loss. My question is: what would be a therapeutic amount of phosphatidal for my age? I am 5ft 2 tall and weigh 112 lbs.