I've known more JW breeders than non-JW. Several JW couples in my hall had 4-5 children.
The fact that they are simply giving JW type excuses about their decision to remain child-free does not necessarily mean those are their real reasons. Most people (including myself) who decide not to have children base this decision on a variety of factors:
1) Not everyone likes children and can barely tolerate their behaviour.
2) Some of us prefer an adult lifestyle and having a disposable income for luxuries such as vacations and fineries.
3) Some of us have extremely demanding careers that exclude the possibility of child-rearing.
4) Some of us like the freedom to do whatever we want, whenever we want without having to worry about nannies, baby-sitters etc.
As for this woman being 60 and "regretting" not having any children. I have never known ANYBODY who regretted this decision, particularly since they usually have stellar careers and incredible accomplishments in their lives, things that would have been impossible with the burden of children.
The only thing I would regret would be the enormous opportunities and experiences I would have to sacrifice if I were to have children, including a diminished career and a near total-loss of freedom and quality of life.