I Am 55 Years Old And Have What Feels Like

I am 55 years old and have what feels like palpitations at the base of my rib cage. They last anywhere from 2-3 seconds and then gone. I have blamed it on stress. I don't have high blood pressure, my cholesterol is goo, have regular physicals within 12 -15 months of each other. Just kinda worried. not sure if this could also be a type of panic attack.