If you really want to tackle this issue, you need to look at why men live shorter than women. Do they die violent deaths more often? Trying to make society less violent could benefit everybody. Do they harm their health by working more often in unhealthy situations? Maybe improve those work situations. Are they more likely to commit suicide? Maybe invest in better mental healthcare. Does testosterone make them more likely to engage in risky behaviour that gets them killed? Well, at some point you've got to decide whether the higher risk and resulting shorter life expectancy is a matter of personal choice or not. I suppose education can play a role here.
Data suggests that more gender equality in society also leads to more gender equality in life expectancy[0]. But we should also remember that the goal of equality has to be to lift people up. Of course we could close the gender life expectancy gap by reducing life expectancy for women (maybe reducing maternity health care?) but I hope everybody agrees that would be a terrible idea. We should tackle the issues that cause men to die earlier.
Well one obvious factor is that society has a bias towards over investing in women's health. Look at cancer research. Pancreatic cancer kills a similar number of people to breast cancer but receives something like 1/100th of the research funding. If we reallocated breast cancer funding to pancreatic cancer, that could reduce the gender lifespan gap while still saving a similar number of lives (or even more) overall.
That's pretty clearly sexism against men, e.g. viewing men as disposable. Remember we test drugs on mice before humans, and that's not because we like mice; it's because they're cheap and disposable.
Imagine we only tested drugs on women. People would definitely see that as sexism against women, if not outright abuse of women! There would be endless news articles about women who suffered permanently debilitating effects of the drugs that were tested on them. There would be feminist protests to stop testing drugs on women.
The drugs aren't being tested on men instead of mice, they're being tested on men instead of women. The reason for that is that men have more stable hormone levels that don't fluctuate over the month and therefore give more reliable test results, but that also means that these treatments don't account for the fluctuating hormone levels of women.
I don't know where you live, but in most countries people aren't being forced into these sort of tests against their will. You make it sound like you're living in a totalitarian dictatorship where people are dragged off the street for dangerous experiments that haven't gone through a rigid testing process yet.