Why are the chances of surviving a heart attack less at the age of 40 to 45?

Q: Why are the chances of surviving a first heart attack at the age of 40 to 45? Is it less as compared to the ones occuring in an older age group?

A:The chances of surviving a heart attack if it occurs at 40-45 years are lesser compared to later, because in patients above 45 years the blockage in the coronary artery takes more time to happen. This allows some time for collateral arteries to form. Collateral vessels are natures mechanism to prevent a heart attack. These vessels bypass the main blockage. People who have more collateral vessels, have a milder heart attack.