Had the same thing last year. They had the alarm set at 50, as soon as I relaxed it triggered. They just ignored it (and me).
Mine is 32 bpm when very fit. Has been less than 40 since I started tri/marathons in the 1990āsā¦got flu last Feb - new I was ill as it was 72bpmā¦imagine some people are like that all the time 
Does anyone here do there workouts based on resting HR, for eg if you HR is more than 5 beats above your avg you would have an easy or an off day because of it?
I had that happen in pre-op when I had my collarbone surgery. Crashed 2 weeks before an ironman that I had been training for. I was fit, tapered (sort of), and well restedā¦ for my surgery. Alarm was set to 40 and it kept going off.
Iām sitting around 36-39. Strange thing is that my systolic number of my bp is always 130+ā¦ My usual BP is 133/70ā¦ Fewer contractions, but higher pressure.
I had elective surgery 2 years ago at age 63. My heart rate in the pre-op room was 45 at age 63. Normal for life long participation in endurance sports.
I would be registering with a different doctor.
A simple well-balance article on the NHS (UK)
Essentially their general advice is to see a doctor if your resting heart rate is either above 120 or less than 40 - but even then that might just be normal for you.
Around 40 bpm for resting heart rate is sure quite normal. Mine is 38-39 bpm after 10 months of intensive cycling training. It was around 48-49 bpm when I started so it has gone down a lot.
I have a question to you guys with a low resting heart rate - do you have also a low max heart rate? My max HR is around 200-202 bpm and Iām 28 years old. I get up to 190-195 bpm in VO2max efforts when I am rested and at FTP efforts my HR is around 178-184 bpm depending how tired I am that day.
I am 48. Resting be below 40. My max is more than 189 as I can hold that in running races. During XC racing, I will see 192 being held.
Not very high - around 160. It was maybe 170 when I was younger. Iām slowly converging towards 220-ageā¦