Really does not sound like children are the cause of the problems there.

I said it has a very different gravity depending on how old the person saying it is. Do you agree or not? Why?

Happy child free, may I ask how old you are roughly? Because to me it seems that this number and that happiness correlate strongly inversely. People are more and more lonely. Less family, fewer siblings, no children, …

There sure are people of any age that are happy without children (or generally with or without anything). But since you mention this and me seeing that correlation: I have to ask. If you are 30 that is essential meaningless, like saying you do not care about pensions. If you are 60 both statements carry a lot more weight.