I m a girl, but when my dad was 51, he had two massive heart attacks. When my dad s dad was 51 HE had two massive heart attacks. When my dad s grandfather was 51 HE had two massive heart attacks. Could this mean I m at risk, even though I m a girl? I m only 15, but I already have a form of heart disease (I have a heart murmur). I m really scared though, and I need to know.