I wonder if this could be attributed to STDs, jealous lovers, and other risks a sexual active person might be exposed to compared to a sexually inactive person.

Or it could simply be reduced stress.

After my second orchiectomy related to cancer, I had to wait several weeks before I could see an endocrinologist about testosterone replacement, so in that time my bioavailable testosterone basically declined to nearly nothing. At one point I became so mellow that stuff that would normally bother me just got ignored. In some ways, it was a kind of a bliss-- I even considered not having testosterone replacement therapy.

That was short lived, however. My endocrinologist told me that I needed testosterone to continue being healthy -- to maintain bone strength, etc., so I ended up doing the TRT.

Very interesting, thanks. I'm curious though, did your doc bring your levels up to normal range or lower, and did you ever discuss this (keeping the levels lower than normal)?

My levels are still a little lower than normal but from a health and lifestyle perspective, I'm otherwise normal to the point I was before my operation.

Because of this, my doctor and I both agreed not have my dosage increased. From my perspective, I just didn't want to use more meds than I need to.

This is an excellent point that made me think. Perhaps you could examine through how the data is collected. You could hypothesise that the mean age of death is affected by non-testosterone increased aging such as murder by a jealous lover. These would pull down that average, where as the mode might show the more the 'typical' lifespan.

However you might also hypthesise that high levels of testosterone might cause you to engage in behaviors that would make make other people want to kill you! Also including other risky behaviors such as driving fast this could also be a direct effect of testosterone.

A very interesting thought!

plus, eunuch are typically purpose-made. how many eunuchs deal with starvation, unemployment, or homelessness?

This does not explain the differences between man and woman. Especially because infection chances are higher for women. Assuming that males and females have the same number of average sexuall contacts.

The evidence for the longer life spans of eunuchs is actually pretty thin. Endocrinology textbooks regard it as unconvincing.

What is very clear though is the association in non-eunuchs of low T levels with a host of very harmful medical conditions including heart disease and osteoporosis.

Studies have consistently shown Low T is associated with these conditions and many more, but the evidence that T fixes them is unconvincing.

From my extensive review of these studies the problem is that the studies were too small and that those running the studies were too often, like too many people doing medical research, statistically illiterate.