When young, death seems a long way off. Even the obese twenty-year-olds who work twenty hours a day, drink more than the approved daily ration, smoke, never commit to a lasting relationship, and take no exercise will assume that the price is unlikely to be paid for twenty years. If they have a Type A personality, even plans to reduce stress won't satisfy their competitive instincts.
Older people, on the other hand, can already see Charon's ferryboat waiting for them to cross the Styx. It doesn't require so much to persuade older people to alter their lifestyles in order to reduce stress. In any case, by the time some agree to this, they may already have developed evidence of stress-related diseases.
Until recently, doctors were equipped only with comparatively primitive diagnostic tools to detect the first signs and symptoms of stress-related disease. It was difficult to persuade patients that apparently nannying old doctors knew what they were talking about, and that their advice had validity. Thankfully, this attitude is changing. It is now much more impressive to say to a patient, 'These include the EBCT (Electron Beam CT) scans of your cardiovascular system. They show that you have accumulated the atherosclerosis of someone twenty years older than you are.' (Atherosclerosis is the fatty substance that furs up arteries.)
From the mid-thirties onwards, unreformed A people could plot the early signs of the long-term stress that will get them in the end. With EBCT scanning, younger people, as well as those of more advanced years, will be able to heed these warnings.