Why is it more probable for an older man than a young man to survive a mive cardiac infarction?

lemuralio - The answer is "development of collateral circulation." A young, "healthy" man has a limited number of coronary arteries of the heart to provide needed blood circulation to the heart muscle. As a man ages, and his coronary arteries begin to age and narrow, the heart will slowly develop additional smaller coronary heart arteries which will spread and criss-cross the heart's circulation. This helps prevent a mive cardiac infarction thanks to blood flow through the collateral arteries and to help survival after a mive infarction due to a coronary artery thrombosis.