Your first source just cites your second source. I definitely think it is an interesting study but there is a difference between a childless person and one who is childfree. The former may have wanted kids but sadly never had the chance. Childless merely means they don't have kids, not that they don't want them. Their obvious regret shows they did want kids. A childfree individual is also childless but wants to be.

Also, they've done studies that show that marital quality often drops after the transition into parenthood, and that there is an increase in marital happiness after the children leave home. In fact, the American Sociological Association conducted a study on this very topic and found that parents are more likely to be depressed than their childfree counterparts.

Of course, all of these studies can be taken with a grain of salt if you ask me. I think we just need to respect when someone says they don't want to have kids instead of telling them they will change their mind.

Personally, I have never wanted kids and I am happy in a long term relationship with a man who feels the same way. I do not want kids for a myriad of reasons, most of which getting older won't change. I hate when people tell me I might change my mind because it is implying they somehow know me better than I know myself.