Unfortunate its possible to have a heart attack
at any age, young or old. I would say if it happened when you were still reasonably young such as yourself, the chances are lower because you've not been around long enough to get the general wear and tear of a heart that becomes diseased.
Again it can happen and is predicted to happen at younger ages now, because of the way people eat, and its supposedly the children of today that are doomed to getting such things in their 40's, due to the fast foods and too much fats that we eat. So its worth while study your own style of food and if need be makes amends. Grill instead of fry, use lower calories foods, drinks lots of water and do things like that, to keep our cholesterol
Remember, prevention is better than cure !!