I think you bring up some interesting points.

My question is that that this is taking the default that the older man is a strong financial provider to both the older woman and his new wife.

Women in my age group, 25-35, often provide as much or more money to the household as their partners. This is not statistics but based on my experience.

Some of these women have no interest in being caregivers in the traditionally feminine sense.

Does this mean in 30 years we will have a bunch of older women leaving their boring husbands for some hot young studs?

Nice read.