Childfree! Who knew we were living like Shakers, Cathars, Skoptsy, and Manichaeans? What does it take to be a childfree couple?
Why would a pair of biological/genetic entities choose to not copy their DNA and pass it on to future generations?
Is it a great act of foresight? Or selfishness? Or pessimism? Don't know. It just worked out that way. Probably a little bit of luck (good or bad is up to you), and blind determination too.
Lots of our friends are childfree too. Many of them are "creators" - artists of all types. Is that a thing, a phenomena? A choice or a circumstance. Fortuitous, or tragic?
Childfree does open space in our lives for other things. We fill that space with other stuff.