For instance, Type A people are usually more cautious and adhere strictly to treatment regimen and generally more health conscious than other people. And an individual who possesses a Type B personality is more laid-back and a Type D individual has more negative emotional functioning that increases their risk to suffer from an illness and die a premature death due to their high stress levels. (Weiss & Deary, 2011)
However, all these findings are largely based on speculations and there is no set way of defining personality, as the phenomenon is vastly subjective and personality and intelligence is an extremely diverse trait. There is no way intelligence and personality can be quantified. Hence, it is a plausible method to predict the longevity of an individual but requires more evidence t back the theory up.