[Knufen]

That sounds very interesting, so you have a source for that? I could not find anything on Google searching for "life expectancy, gender and size".

[sigmoid10]

I believe David Sinclair talks about this in detail in his book "Lifespan: Why we age"

Personally, I see this is less as a real research discovery and more like a cautionary tale on the pitfalls of statistics and the need for multivariate regressions with control variables.