Trump at 77 has serious issues of age for the US presidency says Frank Bruni, professor of journalism and public policy at Duke University. Age is a very personal journey, says one expert, and it depends on how good you are taking care of yourself. On this score Trump has serious drawbacks. Nutrition matters, exercise matters. Bruni says Trump's diet is garbage, and he is overweight. Biden is only 3 years older than Trump, and he is known for healthy eating habits and regular exercise. This is a serious difference that the press has paid little attention to. Another factor in aging is doing something for a purpose in life that extends beyond one's self. Trump's obsessive attention to himself means there is a lack of purpose beyond one's own egoistic pursuit of office which acts as a negative factor in aging.