> By the time the 2016 survey rolled around, fathers were 40% more likely than childless men to see themselves as very happy.
"Happiness" is also not the right concept here. Having kids doesn't necessarily make you "happy." But it's something people almost universally want: https://news.gallup.com/poll/164618/desire-children-norm.asp....
By age 45, 86% of people have had kids, and only 6% of those wish they had not had kids. By contrast, out of those who didn't have kids, more than half wish they did. Even more remarkably, among all adults age 45+, as many people wish they had five or more kids as wish they had no kids (11%).
There is pretty much no other life choice (college, career, etc.) that almost every body does that almost nobody regrets.