I'm 47 and without kids, I was always indifferent to them and decided if I got with somebody who wanted one then it would happen, Once my sisters had kids I lost any remaining interest in the idea, I don't think I would be a good dad as a result of my indifference. My Mrs is very much not interested in them either, Not a good environment for a kid to grow up in I feel. Sometimes people think it's ok to ask why not, For me that question isn't a problem but I can understand how it might be a massive problem for those who wanted them and for whatever reason didn't get any.
I am slightly surprised by a quarter though, Had you asked me before I would have said a few percent tops...