I agree with OP, there are many ways to live a good life & unlike previous generations of women, we can do so, but there is still a lot of negativity around those who don't follow the 'traditional route'.
I couldn't have children, it was upsetting but tbh, I was never someone who couldn't wait to have children, I assumed it would happen sometime, so when it didn't, it wasn't as devastating as it was for others. I have been hurt but some remarks of others who think the way I live my life is lesser because of this.
Re old age, having supported my mum & then my FIL in the slow steady decline into advanced dementia, having children is no guarantee of support & companionship in frail old age. I spent lots of time with my lovely mum, taking her out, keeping her amused in the early days, sorting out all the issues that arise with Alzheimer's then visiting her alternate days in her care home where was very happy,
My SIL, one of my biggest critics for being childless (she never believed I couldn't have them & was convinced it was a lifestyle choice - not that it matters either way but she was always incredibly hurtful) who was always saying 'you'll regret it when you're old, you'll be so lonely' did sweet f**k all for her dad, even though she lived 5 miles away compared to our 250. She rarely visited him when he was widowed & lonely, even though she works very part time, & had no other commitments (divorced, no partner, grown up children moved away) so we spent a long weekend a month with him, every crisis, we sorted out, hospital appts, one of us took a couple of days off to be able to get up there to take him, care home, same issues etc.....
Sadly some people will always judge & some will also be hypocrites. Some cannot see there is any other way to be happy & fulfilled but their way & some are envious as, due to my career, I've got to see the inside of many marriages/partnerships - and that often tells a different tale to what they initially say or portray! As a childless couple, we've really planned our old age as we can't rely on anyone to be our advocates & don't want to be lonely but that's another post!