What is the growth of your heart?

Your heart grows only through your teenage years, just like your bones, genitals and female breasts. The best way to understand the size of your heart is to compare it to the size of your clenched fist (punching fist). An infant's fist is much smaller than an adult's fist. The size of the heart is roughly equal to the size of the fist.

The heart cannot continue growing through adulthood to old age because the cardiac muscle would not be able to fit in the chest or pump effectively if it kept growing. When the heart muscle is damaged and becomes flabby or unable to pump, the person can go into heart failure or can have a heart attack.