Most of my cats are not young, and Sizzle has hypertrophic cardiomyopathy, so their heart health is especially important to me.
The problems with heart disease in cats are that there are often no symptoms until it's almost too late, and heart disease in cats is not often preventable.
Experts say the best form of prevention is yearly checkups (please pass on the "annual shots!" Your cat probably doesn't need them!). Your vet will listen for heart murmurs and other irregularities. And ask for a proBNP test, too. It's a blood test that can detect early heart disease.