You're right about that and, at least in my case, the family genetics start to kick in as well at age 50 or so. That is when I started to develop my inherited cardiovascular conditions my parents passed on to me, as well as the varicose veins in one of my legs, inherited from my father. So both youthful health habits and genetics can be destiny, even if they don't show up until middle age. I have really noticed, at my age, how people who spent way too much time in the sun as young adults and/or were longtime smokers, really show their age or older in their appearance once they start into their 50s. Their skin is wrinkled, yellowed, or very dark brown, depending on their habits, and the smokers teeth begin to yellow also. In the case of my sister in law, she also seems to have mascular degeneration of her eyes, from all the time in the sun. We always seem to pay eventually, for your health habits.