“these are the people who will rue the day they passed up on good moral lovely women who are attractive but not barbies... ”
These good marriageable women are 1) a minority of the female population and 2) get married by age 22 or so, give or take a few years.
The world is not the same as it was for the older generations. What you believe is reality is not.
A lot of those men passing on marriage are doing so not because no one meets their standards. They’re doing it because they’ve made an evaluation that it’s not worth it based on the available potential wives.
They are, more often than not, correct.
Your statement about regret for these men going into old age betrays a misunderstanding of the differences between male and female psychology. While growing old alone is a fear for both sexes, it looms much larger for women. Men are generally able to find meaning through means other than forming a family. Women, not nearly as much.
Not to say that millennial men don’t have their own set of problems. They do. Inaccurate evaluation of their relationship risks and benefits are not among them.
I’ve observed the exact opposite of what you said. Older men do not like to be alone, and they tend to marry again if their spouse dies.
Older women deal better with being alone if their spouse has died. They don’t feel the need to remarry as much as men do.
There are exceptions, of course, but generally this is how it goes.