The increase in men's life expectancy may be due to a number of factors. A lot of research has been done on the subject, but essentially, numerous changes in men have been noted. The cohort of baby boomers now entering old age had different lifestyles than men in the generations prior. Previously, men didn't work in the same fields or have the same lifestyles as the men of today. That has an impact on health.
On February 21st, 2019. See this statement in context.