Your Body is your Temple

Does the body has to age ?

I mean does the body have to have a lower metabolism as a person ages , as one reaches 30 and 40 . I thank God that I'm still young in and my body burns fat because I have a high and fast metabolism and because I'm small boned so when I reach 30's and 40's and beyond I'd still have a body of a teenage or a person in twenties. I've seen people in thier twenties who have a curvy body with cellulite around the hips and a big stomache as if they have given birth, but they are still single , I mean if this is how thier body is now , what will happen when they get older , and i've seen people in thier 30's with a body that belongs to skinny and fit 18 year old ,and that of a 16 year old , so I guess genes does play a role in a person's body and if one wants to stay fit , just eat healthy.