Just learned something about pregnancy

Why older women, older than 35, especially above 40, tend to have difficulty get pregnant, have miscarriage 
and birth defection. Why it takes some younger women one year to conceive. Then have miscarriage.
It's all because bad eggs are exceeding good eggs in those people's ovary reservoir. Aging or genetic cause.
Chromosome disorder during fertilization thus is more likely to occur.
Pretty dismal message to anyone above 35 who wants more kids, isn't it?
Lucky I already had one healthy child at a proper age, albeit quite late in general.
If the second child won't come properly, I should say it's God's will, not human fault.
Just cross fingers. Not place too much hope anymore.