Can you have coronary artery disease at a young age?

Yes, but less likely: Coronary artery disease definitely increases in prevelance with aging. There are less common cases of CAD in younger people and are more associated with family history of CAD in young age, smoking, and diabetes. Also coronary spasms can occur, but are more likely assoc. With drug (such as Cocaine or amphetamine) use.

Yes: Not usually to the degree of heart attack , but some plaque in american troops identified in18 year olds. Some others with hyperlipemias, diabetes etc.