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www.reference.com/article/average-heart-rate-age-a1c39080cee30af5

Normal heart rate varies based upon age and activity level. A resting heart rate is typically above 60 beats per minute. It changes as an individual ages. The Mayo Clinic explains that a well-trained athlete often has a lower resting heart rate, closer to 40 beats per minute.

www.reference.com/article/can-average-heart-rates-based-age-dec6af90564f51bc

Average heart rates based on age can be found on WebMD. The average heart rate changes depending on whether a person is at rest or doing physical activity, states the American Heart Association.

www.reference.com/article/normal-heart-rate-person-aged-25-years-old-cd27b3496a803418

The normal heart rate range for adults, including those who are 25 years old, is 60 to 100 beats per minute, as noted by the American Heart Association. That is only an average range, so some people might have fewer or more beats per minute.

www.reference.com/article/someone-normal-heart-rate-particular-age-dd634fcfd37a767e

The normal heart rate for a specific age can be found at a variety of sources, but Mayo Clinic states that the normal heart rate for adults can range from 60 to 100 beats per minute. To check an individual's heart rate, simply place the index and middle finger on the radial artery in the neck, next

www.reference.com/world-view/average-heart-rate-female-aged-63-d93a5b1cf48fcece

The average heart rate range for adults who are over 18, including a 63-year-old woman, is 60 to 100 beats per minute, according to Cleveland Clinic. This range is based on the resting heart rate, so it isn't applicable during periods of exercise.

www.reference.com/article/normal-heart-rate-age-77-a1d0ce08bae2e525

A normal resting heart rate for adults, including seniors, is 60 to 100 beats per minute, according to the American Heart Association. The resting heart rate is the number of times in a minute that the heart beats while a person is at rest.

www.reference.com/article/average-age-horses-live-f2b09d741cc11ff0

The average lifespan of a horse is currently 25 to 33 years. The average horse lifespan has been steadily increasing as advances in care and medicine keep them healthy longer. Many horses today live healthy lives into their 30s, as of 2014.

www.reference.com/article/average-age-babies-sit-up-e4c32a74cf720d19

While all babies progress through milestones at different paces, most babies sit on their own by seven months of age, according to Baby Center. It is considered a red flag if a child seven months old, or older, cannot sit unassisted.

www.reference.com/article/average-age-girls-stop-growing-a4971eb839b724ff

As with all animals, growth ceases once the growth plates on the bones have fused, which happens at approximately age 21 for the average human female. Men generally reach their maximum height by the age of 25.

www.reference.com/article/average-retirement-age-doctor-7a135579e4d73504

The average retirement age for a doctor is about 65 years for male physicians, and female doctors often retire sooner than males, reports the Houston Chronicle. The average retirement age for internists was 62 in 2002 and 70 in 2009. By age 75, 80 percent of male doctors have retired.