How many heartbeats in a lifetime does the average human get?

Does every species get a billion heartbeats per lifetime?

This article fascinates me. And I quote:

There’s an assumption that because of the relationship between metabolic rates, volume, and surface area, animals get an average of one billion heartbeats out of their bodies before they expire. Turns out there‚Äôs some truth to it.

Medical professionals say this billion-heartbeat claim is nonsense. But is it? It kind of makes sense to me.

It reminds me of a car. When the fuel runs out, we die.

So:

Over the years, I have put easy-to-implement strategies into lowering my resting heart rate.

This includes the Wim Hoff Breathing Method:

And even more important, eliminating all mouth breathing – instead, breathing through my nose at all times using the Buteyko Breathing Method:

So far, so good for me. I check my resting heart rate often. And it is a LOT lower than it was when I was in poor health.

If we can believe the Mayo Clinic:

A normal resting heart rate for adults ranges from 60 to 100 beats per minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats per minute.

I often see my heart rate near 70 beats per minute. I know I am dehydrated when I am rested and seeing above 100 beats per minute.