I don't remember where I originally picked this up, but I recall reading that generally, for warm-blooded mammals, there is a pretty strong correlation between

I don't remember where I originally picked this up, but I recall reading that generally, for warm-blooded mammals, there is a pretty strong correlation between resting heart rate and lifespan. Except that humans are a huge outlier. Ah, here's the graph, possibly not from the most reputable source, but it's what the googles found me first http://www.runnersworld.com/sweat-science/how-many-heart-beats-do-we-get http://www.runnersworld.com/sweat-science/how-many-heart-bea... I do sometimes wonder if the delaying of child-rearing has some effect on lifespan. Historically, it's not uncommon to find mothers and fathers in their mid teens, and adulthood was commonly understood to start at something like 16 or 18. In western countries, we're deferring child-rearing into the late twenties, early thirties, and full adulthood keeps creeping upwards as well.