A normal heart rate is 72 bpm as far as I have ever heard. If you are talking about "resting" heart rate, like I just woke up from a powernap, it's still in the 70 bpm range as far as I have ever been told.
If you exercise regularly, as a teen you should be able to get it down about 15-25% if you are in good aerobic shape. My normal heart rate is 60 bpm, I'm 35 and I play hockey a few times a week & do some running (5 miles a week or so). You might be in far better shape & have a heart rate of 80. My dad smoked for 64 years, had low blood pressure & his heart rate was under 50. Unfair, but it's different for everyone.
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