Normal resting heart rate for adults is between 60 and 100 beats per minute, according to the Mayo Clinic. Resting heart rate varies considerably by age, but after 16, teenagers have the same normal range as adults.
Average resting heart rate increases from birth to the age of 2 months, according to the University of British Columbia, then declines from there onward. Top End Sports notes that athletes with excellent cardiovascular health may have a resting heart rate as low as 40 beats per minute. This is a sign of a fit and efficient body. They also note that heart rates for people of similar activity level differ slightly based on gender, with women having higher average heart rates than men.
Newborns have a resting heart rate of 70 to 190 beats per minute, MedlinePlus says. For infants one month to 11 months, the normal resting heart rate is 80 to 160 per minute. At age one to two years the normal resting rate is 80 to 130, at three to four years the normal resting rate is 80 to 120, and at age five to six the normal resting rate is 75 to 115 per minute. Children aged seven to nine have a normal resting rate of 70 to 110 beats per minute, and those 10 years and older have the same normal heart rate as adults.