The question is whether that's cause or effect - and regardless, the correlation between metabolic rate and lifespan clearly isn't very strong (as in there are

The question is whether that's cause or effect - and regardless, the correlation between metabolic rate and lifespan clearly isn't very strong (as in there are many other factors that probably matter). In the big scheme of things, a mere 27% difference isn't all that great. I mean, heck, hummingbirds can live to be 10 which is more than twice as long as even record-breaking genetically engineered mice, despite hummingbirds having an unusually high metabolism. The 27% difference more remarkable if you consider how similar we are to other apes. Regardless, I can't imagine that simplistically extrapolating lifespan from metabolism is particularly accurate, even if it gets you in the right ballpark.