I got a 37 about a year and a half ago in the doctor's office during an EKG as part of an annual check-up. I was 69 at the time. Never have measured the actual resting. I make a point of getting my HR above 90% of measured max periodically for health reasons. It does impact resting HR.

A couple of months ago I got a 42 just walking around before a walk/jog to get my heart rate monitor's GPS to acquire satellites.

Al