The ideal waist measurement for a 6-foot man varies depending on overall build. However, if a man's waist exceeds 40 inches, he is considered to have too much belly fat, according to the Mayo Clinic. Excessive belly fat can lead to health problems, including sleep apnea, cancer and cardiovascular disease.
As men age, they become more prone to developing belly fat and are more susceptible to its associated health risks. It is important to find ways to avoid weight gain and reduce belly fat. Monitor alcohol intake and cut back if necessary. Increase daily activity rates by taking stairs rather than elevators or escalators. Avoid sitting for long periods and make an effort to move about more.