What I have seen over my 78 years and decades on heart medications is that medications play a big role in heart rates. Unless your heart rate was very low before taking medications should look at medications for being so low.

The normal heart rate (HR) is 70. But that is a statistic and does not mean below or above it is a health issue. When pulse rates get to low heart arrymthmia can happen and or those who have PVCs can go up. Along with that dizzeness.

Many athletes have extremely low HR. Why? There heart is is great condition and when it pumps it provides the amount of oxygen the body needs and thus not a high PR. Many athletes wind up getting a pacemaker as there HR is so low and they do develope arrymthmia (spell) problems.

My pusle rate used to be in 60s (active exerciser) until put on Entresto and Carvididol. My pulse rate went down into 30s and many many PVCs. My EP raised my pulsing of my Pacemaker to 50 but PVCS continued and we sent to 60 and then to 70 where the PVCs went down dramatically.

A question on low HR and long life is something I cannot comment on as not medical doctor. But your heart is a muscle and it needs exercise to stay strong. A low HR means either medication or medical problem or a very strong heart. If it is because of a very strong heart then by statistics your physical heart healthy is going to be on excellent side with probably a very high ejection fraction.