For adults 18 and older, a normal resting heart rate is between 60 and 100 beats per minute (bpm), depending on the person’s physical condition and age. For children ages 6 to 15, the normal resting heart rate is between 70 and 100 bpm, according to the AHA.But a heart rate lower than 60 doesn’t necessarily mean you have a medical problem. Active people often have lower heart rates because their heart muscles don't need to work as hard to maintain a steady beat. person's target heart rate zone is between 50 percent and 85 percent of his or her maximum heart rate, according to the AHA. Most commonly, maximum heart rate is calculate by subtracting your age from 220: 1  220 - Age. 2  For a 30-year-old person, for example: 220 - 30 = 190.