Hiya all - hope you don't mind me popping by. I had a quick read of your lovely thread and wish I'd found something similar when TTC my first, as it felt like a lonely place at the time. Perhaps I can share something in the hope it might be a little encouraging.
At 42, I had some hormone tests done when we were first thinking about TTC. These were all fine, except I found I had an underactive thyroid, so we didn't 'try' while it re-balanced with meds. Then, as I was 43 and (unecessarily) panicking like a loon, we thought we'd crack straight on with IVF, at the clinic where I'd had some of these initial investigations. Except new tests showed my day 3 FSH was now 19.5 and my U/S AFC was really low. I was told, rudely, it was 'impossible' I'd get pregnant, but maybe come back next month and look again, although not to be hopeful. That same month I conceived my DD naturally. She was born almost on my 44th birthday. Bizarrely, since I've had DD, my FSH and AFC have been significantly better - despite being older - so go figure.
I don't think getting pregnant at 43 was tremendously remarkable, lucky, unusual or whatever. That's not to say that I don't feel the luckiest person alive to have my particular DD, as I idolise her, but don't all parents feel like that? But getting pregnant at 40+ seems relatively ordinary, and no reason why any of you shouldn't do the same. If you look at many of the threads on 'how long did it take to conceive' you'll see anything from 20 minutes (ha ha) to 18 months and beyond. I think its maybe that time at 40+ seems to take on a different significance ....
Someone asked about things to improve egg quality. This book has been posted about on Mumsnet a fair bit (so I'm not pretending its my original idea) but a great source of tips is 'It Starts with the Egg: How the Science of Egg Quality Can Help You Get Pregnant Naturally, Prevent Miscarriage, and Improve Your Odds in IVF' by Rebecca Fett. link to Amazon . It talks about how eggs take 90+ days to go through the second stage maturation process, so you have a 3 month window to influence their development prior to ovulation. It helps you tailor an approach for you, and when discussing the various supplements, includes contraindications e.g. don't take if you have PCOS, which is all good.
Oops - sorry for the mega long post. But good luck!