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

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.