Metabolism is the conversion of food we eat for the production of energy for cellular activities. The rate this conversion is done is totally dependent on crucial factors such as age, the kind of food eaten, healthiness of the gastrointestinal tract. Interestingly, metabolism can determine whether one can be overweight or of good weight.
As we age, our metabolism slows down and this in turn would affect the rate at which the food we eat are converted to energy, as well as the way our weight can be maintained. For example, if you are aged and eating junk foods and not engainging in physical activities at all. This would definitely cause you to gain weight, consequently leaving your overall health in bad state.
So therefore, as one is getting old, it is advisable to eat not processed food but balanced diet and live a healthy lifestyle by exercising regularly and if possible avoid drinking of alcohol and tobacco, and also ensure to replace carbonated soft drinks with intentional plans of drinking plenty of water.
It's only through these practices can one metabolism be efficient to function like that of young people, hence help in maintaining healthy weight.