There is no such thing as “best”. The normal range of heart rate varies depending on the population and is generally between 55 and 140 beats per minute.
For adults, the range is 60-100 beats per minute; for the elderly, the range is 55-75 beats per minute; for newborns (1-28 days), the range is 120-140 beats per minute; for infants (1-12 months), the range is 110-130 beats per minute; for toddlers (2-3 years old), the range is 100-120 beats per minute; for preschoolers (4-7 years old), the range is 80-100 beats per minute; and for middle school-aged children (8-14 years old), the range is 70-90 beats per minute. ～The heart rate is a vital sign of a person’s life.
Heart rate is one of the vital signs of a person, representing the number of times the heart beats per minute. A heart rate within the normal range ensures adequate blood supply to all organs of the body. A fast or slow heart rate may be a response to diseases such as hyperthyroidism or heart failure, or it may be an individual difference due to age, gender or other physiological factors.
If your heart rate is too fast or too slow, you should go to the hospital for examination and treatment under the guidance of your doctor.