For what it's worth, I'm 69, have been an athlete all my life. Since high school, football, runner, motocross, bicycle racing, then when I had to support a family, letter carrier walking 15 plus miles a day. I had a resting HR in the mid 30's and it would stop for up to 4 seconds at a time about six months ago. Had a pacemaker put in. Then an ablation to get rid of atrial flutter. I still have afib and take pills to help that.