My boyfriends brother is 32y/o and just a triple bypass (aka, CABG) in Feb. 2008. He was having the signs and symptoms of a heart attack (and of course, he was having one), but his EKG showed that he had already had one in the past that he was unaware of, so, EKG's and Lab test such as a Lipid panal should start early, just b/c you feel healthy and have not had problems means nothing.