Ahh I'm so happy to have found this thread. Myself and my partner are late twenties and are resolute in not wanting children. Neither of us have ever wanted them. In fact, I used to think I had something wrong with me because I never pictured a wedding or kids like all my peers etc. The thing we find tough is the fact that as we're still young, people love to tell us we will change our minds. We're both only children which I know makes it tough on our parents that they won't get grandchildren, but that is certainly not a reason for us to have them. People act like we are "so young" to know what we want, we aren't teenagers, we're grown adults who both run successful businesses and have been together for 10 years and don't want or see children ever fitting into our lives.
I would however love some tips on how anyone coped when the point started where everyone around you started having kids. I have a couple of friends with babies now and can sense amongst my friends that they're all getting ready to pop one out. I know it won't make me want one, more I will likely mourn the friendship I had with them now there's a baby to throw into the mix. And of course, I'm sure the "oh but wouldn't you like just one" comments will be thrown around this Christmas too.
We're also not fussed on getting married either, we own a house together and I see that as bigger commitment than a ring but of course, as we've been together so long every time we go on holiday or I dare to get my nails done I'm asked "oooh do you think he will propose".