Happiness is a caveated crapshoot
I'm fairly certain we are all capable of the google search and you can and will find the multitude of studies, anecdotes, memes and conversations about:
- women's unpaid labor at home, with their children, in their community and for aging relatives/relatives who need care
- women's thwarted ability to get promoted
- women's inability to negotiate as easily for a raise bc when you're aggressive you're a bitch and when you're not you dont get a raise
- women's emotional labor in relationships as men in our specific (NA/Euro) societies tend to have limited social circles as they age
Single childless women are happier for structural and social reasons. It is not in fact just a crapshoot.