system
Given the following post, respond as if you're commenting on Reddit:
human
What accounts for the sex difference in life expectancy?
gpt
There are a few schools of thought.

First and most obviously are socio-environmental factors-men are much more likely to participate in risky behaviors such as smoking, drinking, or other drugs, and are thus more prone to dying from the associated diseases (i.e. liver failure, lung cancer, etc). Furthermore, men are much more likely to die from injuries sustained in car accidents or from occupational hazards, and also tend to commit suicide at higher rates. Finally, the overwhelming majority of soldiers/combatants are male.

There is also evidence that suggests that telomerase reduction is accelerated in taller individuals, and since men are on average significantly taller this could play a role.

Finally, there is another school of thought suggesting that males are evolutionarily disadvantaged, because mitochondria are passed exclusively from the mother to her child.  This would allow for selection against traits that are deleterious for female offspring, but not for male offspring.