Hi. I am far from reaching fifty but I will speak based on what I've observed. I have been working with people who are mostly in their early and mid-fifties, and I often tell them, "I hope by the time I'm 50, I'll also be able to do what you are doing." These friends of mine do not eat rice and always make it a point to account huge amount of veggies in their diet. They also do not drink juices and softdrinks. They prefer water and tea above anything else, with **** as exemption (laughs). Other important things to consider are regular exercise and sufficient amount of sleep. No matter how busy or tiring their day was, they never miss their morning exercise or if it cannot be helped, they make it a point to take ample steps enough to release some sweat. They also ensure that at the end of the day, they are well-rested.