He never had his HR monitored before?
Low HR can just be a normal thing for someone.. even before doing any sports, 40bpm when standing around was normal for both me & my brother (teenager). Even now (am 45), 50bpm at rest (40bpm as waking RHR) is totally normal and I'd say that at 50yrs I still expect it to be in the high 40s/low 50s.
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