35 tops.
No way in hell would I be having babies after that. Even though a woman of 44-45 may feel youthful and full of the joys of spring, having a baby at that age is absolutely crazy. It's bloody hard work, and tiring when you're 15-25 years younger. Having one at 44-45? NO WAY.
Also, there is no getting away from the fact she will be taking her infant to primary school in her FIFTIES, and will be a pensioner when said child goes to uni.
I have known around a dozen people with much older parents (had them past the age of 42,) and the majority of them said it was embarrassing for them to have parents who looked like their granny or grandad. And most of them lost their parents when they were only in their twenties or thirties.
OR they ended up having to be a carer for an ailing elderly parent when they were only in their 20s. Or when they were in their thirties and had young kids of their own. So it was a very stressful time.
Again, the 'my auntie foofoo is 103 and skydives every week, cycles 27 miles a day, and has worked since she was 11, without a single day off sick' brigade will no doubt be around soon... But the reality is, that for most people, their natural shelf life of good health is around 65. Some are even younger.
There is also a much higher likelihood of there being problems. With the pregnancy, the birth, and beyond.
Despite the bizarre 'you're just a spring chicken at 55, and can start your life over' mantra that some people have on here, with their 'I am 56 and run a marathon every day' type of line; in reality, most people will start to tire out, have less energy, and feel more knackered and worn out when they hit middle age. (45-48.)
The thought of having young primary age kids, and all the shit that goes along with it, when you're about to hit 50 is utterly horrific.
I don't envy ANYone who has babies after the age of 41/42. Must be a glutton for punishment.