I did metabolic testing last Feb (39yro) my resting is 55, my aerobic threshold is 165 (zone3) and my Anaerobic threshold is 183 (zone5). my HR runs really high and my resting is very low. I am in Denver CO and am a mountain climber high altitude peaks here, not sure if that has anything to do with it but i do train with a chest strap and average on uphill climbing is more in the 160-180.
I tend to run higher then most my friends do, never really though much about it.