I think most people lose their irony when they have kids.
Few people can be ironic, which means being uninvested, with their own children.
Which means a lot of people aren’t growing up until they start having children. Which is kind of sad.
I think irony is kind of like sophistication. Back in the early 60s I remember my considerably more wealthy cousins being bored out of their gourds by our simple pursuits when they visited. Quite a bit of the time I could see they really wanted to jump in, but it would spoil their pose of being big-city sophisticates.