Adults, children, babies and athletes all have a range of what their normal heart rates should be. These numbers differ slightly as there are different requirements for the bodies of these individuals.
The heart rate of a normal, healthy adult should be between 60 beats per minute while at rest and 100 beats per minute at any point throughout the day with normal activity. These rates can vary slightly depending on how strenuous the activity is and how physically fit the person is.
For the newborn up to one month old, normal heart rate should be between 70 and 190 beats per minute. For the infant one month to 11 months old, the normal heart rate should be between 80 and 120 beats per minute. The child age one year to 10 years should be between 70 and 130 beats per minute and the child over 10 should be the same as an adult.
The athlete that trains hard every day, or the runner may have heart rates that dip as low as 40 beats per minute at rest and may never go higher than the 100 beats per minute, even when they are performing cardio exercise.
The heart rate in elderly persons tends to slow slightly with age. The older a person, the slower their resting heart rate will be. This is not to say a resting heart rate that is unusually low is considered normal. If in doubt as to what a normal heart rate should be for an elderly loved one, as their personal physician.