― Give yourself the kind of 50th birthday gift that you really need. If you haven’t done so already, now is the time you need to start taking care of yourself and get ‘fit at fifty’. ∙ 1. Eat More! Throughout life, your metabolism undergoes changes, and unfortunately as we age, it actually slows down. In order to ensure that you get all of your necessary nutrients, start incorporating more fruits, vegetables, and whole grains into your diet. By simply adding these fiber-rich ... .