I can only speak for myself of course, I have no idea about the statistics here.
I am 42. My kids are 16 and 20 (the eldest getting married next week) so I wouldnt call myself 'child obsessed' nor do I want anymore - but I suppose I do chat about them often enough on here and in private, simply cuz they are a big part of my life.
I am sure though there are women out there who have never had kids nor want any in the future.

I guess that makes me the needle in your haystack as I am "child free and want to stay that way" - but don't ask me to pretend my grown up kids dont exist cuz I am proud to mention them.
Actually, I would have thought that the age group of women who have dependent kids and possibly want more are in a much younger age bracket than you suggest?

Ticking boxes -- hhhmmmm, a tad too black and white perhaps?
If I were to join a site where you tick these boxes (I have seen them) I would tick yes on both counts - simply because I do have 2 kids and the tick box does not give the option to say they are grown up and dont live with me, and also I would be happy to meet a man who has kids, which is why i would tick yes to wanting them. Perhaps that is wrong and it means to actually have babies which would be clearly a No for me....I can only guess and assume that there is also an option to expand on what those ticked boxes mean.
Or maybe its just a case of more women these days are waiting til after they have satisfied their need for a career before looking to have babies?