I’m younger than the age group in the OP, 43, and childfree by choice.
I love children - in small and easily controlled doses. My friends’ kids love me madly, and I love them all and enjoy their company, but that enjoyment is based partly on their own little perfect selves and partly on the fact that when I’m ready for something else, I can move on without guilt.
Basically, I’m selfish and I realize that about myself. I do not have within me what it takes to focus solely on the health and welfare of another human being for years. I want to be able to stay out all night, or change plans at the last minute, or go camping at the drop of a hat, or…whatever…and only have to worry about the dog.
I’ve gotten some “you’re so selfish not wanting to have kids!” statements in the past, to which my reply is, “yep.” I’ve also gotten, horrifically, the “you OWE it to the world to have kids because not enough smart white people are having babies!,” to which I’ve given the only appropriate response (either verbal or nonverbal).
I’ve also heard the “you’ll change your mind when you meet the right person” (for me, the right person ALSO doesn’t want kids), or “it’s different when it’s your own,” and that latter one bothers me the most. What if it isn’t different, for me? What if I decide to get pregnant and have a child, all the while expecting to want to be a parent once the child is born (because after all, it’s different when it’s your own), and…my lack of interest doesn’t change? Now, I’ve got a child I don’t want, and that’s kind of a permanent thing.
I occasionally get the “I’m going to die alone!” feeling, and I have to admit that the thought does bother me somewhat. I just am making sure to cultivate lots of really wonderful friends of all ages to ensure that when I die, I’m missed immediately, and my body isn’t eaten by my cats 