Okay, your science is WAY off.
1) While it's true that women lose a fair number of eggs from their ovaries every month, well beyond the number of mature eggs that are released, your actual numbers are not consistent with known science. Look it up again and please edit with the correct numbers.
2) I am not sure which years are the peak of fertility for women (and I don't trust your numbers) but just because you say a 5 year span is the peak does not mean fertility is especially difficult during other years. Most women will conceive within 6 months of trying up to the late 30's. Then it starts to slow down, but conception is not particularly uncommon into the early 40's. Even into the mid-40's, it happens more than you think. Some women can conceive later but that's unusual.
3) You state: "It is well known that pregnancies over the age of 35 are considered high risk and can lead to complications." How do I say this nicely? I can't really...this statement is utter and complete baloney. In fact, it's extremely insulting.
What you are thinking of is the magical number 35 in regards to risk for Down Syndrome. That's where the risk goes up to about 1 in 250 (it doesn't even hit 1% until age 40).
There is no extra risk at age 35 in regards to the pregnancy itself or for complications. The only additional risk is a tiny increase in chromosomal abnormalities when the gamete is formed. That is it. There is no difference in pregnancy or birth. Very young age of course is a high risk factor but being in your late 30's or your 40's is not a high risk factor. I had two kids in my 40's; I know exactly what risks are real and which ones are made up.
4) We already have plenty of women with insufficient egg fertility carrying fetuses to term. A fair number of women conceive with egg donors. Occasionally someone is avoiding a genetic problem being passed on. Some women carry babies made with other women's eggs because they are acting as surrogates. But most women who use egg donors do it because they are experiencing infertility. This can be early menopause or other issues when they are younger. Or it can be infertility due to age. While conception this way is more difficult and there are early miscarriages, there are no complications due to a woman being close to or past the onset of menopause during pregnancy (aside from needing to take hormones in many cases).
In fact, there are cases of fully menopausal women in their 50's and 60's getting pregnant (with medical assistance of course) and delivering healthy babies.
The problem with menopause is with conception. If your species does not experience menopause then conception can happen (perhaps it is more difficult with age, perhaps not). Pregnancy will be the same as for younger women. As long as the pregnant woman does not have age-related health issues, problems with energy/endurance, bone stability, etc, there should be no additional risk factors to pregnancy or birth.