Can I just say - lot sof people saying - you can't know the awfulness of infertility and yes of course I would if I could, and if you have kids you can't understand it.
I have every sympathy with someone who desperately wants children and hasn't been able to have them.
On the other hand, I am 56 and have a dd who is 16. So while I cannot know the agony of wanting a child, I can 100% know the cost and the effort required ot bring up children. That dd is my youngest of 3.
Those of us who have kids are saying no, not because we sit on the privilege of having kids but because we know exactly how much it takes, and while most 50 year olds could manage, that is just the beginning. I still parent my older two aged 21 and 18, and having a baby aged 50 means I would be doing that aged 70. I have seen in my own (fit healthy and young at heart) parents how much they age at that point. There is a huge difference between 60 and 70. And I am now supporting elderly parents (now in 80s) alongside teens. I cannot imagine how hard that would be alongside toddlers.
I said in an earlier post that yes, I could imagine having a 6 year old (so born at my 50) but it would come at a cost, and the bulk of that cost is to the child. So no, I would not choose to have a child at age 50, because I know exactly how much time and effort it takes to parent well for 20 years.
I also think that people are naive about assuming that a baby is healthy and NT. Even with donor eggs etc many, many kids have additional needs and bringing up a child with additional needs requires so much more. My 16 year old dd has just been diagnosed with autism. Parenting her has been much more challenging and exhausting than my older two.