I think you both, Tucker and Occam, need to understand that these studies talk about average (!) lifespan.
Occam, you won’t get a heart attack if you increase your testosterones at your age, or extend the length of your life by 20% if you get castrated. What happens is that young men with higher testosterones have a higher chance of getting killed, ultimately having an impact on the overall lifespan of all males. Having higher levels of testosterones also results in men taking more risks, many of them ending up disappointed and depressed. Long-term depression can deteriorate the heart, leading to a heart attack.