There are many factors that contribute to heart disease such as lifestyle (smoking & alcohol) but to answer you question over 83 percent of people who die of coronary heart disease are 65 or older. At older ages, women who have heart attacks are more likely than men are to die from them within a few weeks.
Some babies are born with "heart disease". Some young people die from undiagnosed "heart disease", such as football players after a hard practice or game. Adults who get some types of heart disease, such as plaque in veins/arteries, eat the wrong foods. There are many types of heart diseases--some caused by the congentital factors, and others from poor choices of food and lack of proper exercise.Some people have weak blood vessels, and might get a leak (anuerysm). Prevention suggestions: Pick the right ancestors. Eat healthy. Exercise properly. Avoid smoking, drinking, illegal drugs, and dysfunctional people. Fat and Stress Kills