@05ThirstyGhost
"p.s. the phrase, "pushing it" should be banned. Pushing what?"
Pushing it, means to force, or persue something, 'push to the limit'. So if you are pushing for a baby by the use of donor eggs etc, then it fits.
There's also the use in regards to age, which is short for, 'pushing up daisies' ie in your grave.
Both perfectly acceptable.
There's lots of groups of people who ideally shouldn't have children, as said, why just pick on age?
I worked in Children's Services and we'd have foster carers into their 70's. Their energy and patience was astounding. We had a Woman in her 50's, who was a ling term foster for three Siblings aged six months to three years old.
I had mine under 30. Now, in my 50's I'm a hands on grandmother. I don't recognise the lack of energy that people are describing. My DD works away and i have my Grandchildren for her. I cope better than her with sleep deprivation. In fact she came to stay with me, at times, so i could do the night wakings and early mornings. I acted as a night nanny for her, in my late 40's and no, i didn't sleep during the day.
My Mother had me at 40. She helped me with mine, into her 80's.
I would set a cut off at around 55, though, unless there are very special circumstances, such as wealth, younger partner, really supportive family etc.