Hi, I am 61. I have a 17 year old and a 13 year old. They are pretty great actually, and definitely seem glad to be alive!
I am also medically qualified (not obs and gyne nor GP though). However, I think that there is a limit to what doctors actually can know; these issues around miscarriage and genetic abnormalities etc involve complex risks and much of the decision-making will be around how much risk you are comfortable with, and what you really want and can cope with in this situation, and a doctor can't tell you that.
At one point, after 3 miscarriages close together, an infertility doctor told me that, at 42, let's face it, I definitely would never have children. I didn't really absorb the tragedy of that opinion, because it didn't seem quite that cut and dried to me, although of course it had been awful going through all the miscarriages. By the time my next appointment came round, 3 months later, I was pregnant with my son (now 17). I'm 100% sure the doctor meant well, but I can see why a GP might be deliberately non-committal with their advice. I can also see that this hedging of bets might be frustrating to listen to.
My oldest has autism and ADHD, though is very gifted intellectually and copes pretty well socially now, after various difficulties in primary school. His cousins, whose parents were much younger when they were born, also have autism, so other genetic factors are in the mix here. Otherwise, our kids are pretty healthy and thriving.
I am rather enjoying having teens at this stage of my life (but was able to take early retirement).
I didn't have any other children; so was absolutely delighted if a bit surprised to have a family in my 40s.
My obstetrician said she would be really happy to support me through a third pregnancy, but we felt done with 2 at our stage in life. We were considering that we were lucky to have 2 healthy children, that the risks of problems would increase further with a subsequent pregnancy and what would the impact of having a third, disabled child be on our existing children (and on us)?
I was diagnosed with PCOS in my 30s and have a family history of diabetes, so I wasn't all that surprised to have gestational diabetes, which was very well controlled with quite a careful diet lowish in carbs and high in protein and vegetables.
I went for a scan at around 11 weeks with Prof Nicolaides in Harley Street, for my second pregnancy. One set of decisions is around which investigations to have, to get the information to manage the risks.
I found it very helpful to think that there was over 90% chance that nothing was wrong with the baby, for example, rather than thinking, oh there might be a 3% chance of Downs or whatever.
I hope these random thoughts might be helpful and wish you all the best of luck, whatever you decide x.