If we look at the past 40 years, the life expectancy of women who have reached age 65 increased from 80 years to 86 years, and for men it increased from 79 years to 84 years.
This fact, together with the fact that the retirement age increased by only 2 years, means that men are expected to live an average of 17 years after retirement, and women are expected to live an average of 24 years after retirement.