Basically, women's life expectancy has gone up. That said, the life expectancy of men has risen more quickly. In other words, the life expectancy gender gap is shrinking. Men are living longer than before. That explains why senior men are more likely to be in a relationship and fewer women are widowed. Women are more likely to be widowed than men, but the gap isn't as wide as it used to be.
On February 21st, 2019. See this statement in context.