Somewhere between 38-45 your body stops producing viable eggs. However, if you had frozen eggs saved from before (or donor eggs) you could get pregnant later.

The clinic near me said they had one patient produce a viable embryo at 47, but that was the first time any of the doctors had seen that in their entire careers. Usually early 40s is the limit. IIRC the kid is a healthy two year old now, no issues.

Pregnancy is totally different than egg production. You can carry a baby at a much older age. The clinic near me has an age cutoff of 53 for embryo transfers. Any pregnancy after 35 is high risk, but in terms of carrying the pregnancy 40 and 50 are only marginally different.

No menopause isn't a big issue as the placenta produces the hormones needed. A post menopausal woman would need a few weeks of hormones before and after the transfer, but once established the pregnancy would be self-sustaining. The clinic had some patients who lost ovaries and they claimed that was no problem so long as they had some good eggs frozen.

You almost never see pregnant women in their late 40s or 50s because of the egg issue, but with frozen or donor eggs it is possible even later.