Answers:
9-11 years 60-110 (88)
12-16 years 60-110 (80)
>16 years 50-90 (70)
the numbers in parenthesis are the average.
If you want to know your max recomended shift here
http://www.clevelandclinic.org/heartcent...
Between 60 and 80 are average for resting