The ripe age for any conceivable woman to get pregnant should be from adult age, which is 18 years and above. It is believed that at this age, the woman's reproductive organs are ready for the various processes involved in the gestation of foetus. Although this age might vary from one woman to another due to differences in the reproductive hormones and the development of the reproductive organs, but it's still the most acceptable for a woman to take in.
However, apart from the age, there are other factors some people might decide to take into consideration before getting pregnant, which could be the emotional, financial and mental states of the woman involve. Yes, it is very important to critically look at these factors, because it won't be right to embark on something as crucial as pregnancy when either one of these things is missing.
The woman must be emotional stable so as to avoid the unprayed for to happen. Same goes for the financial aspect, because the woman needs money for all the ante natal care expenses including good foods better development of the baby in the womb. Not forgetting that the baby things that needs to be bought before delivery of the pregnancy. Let's not forget the post natal care of the mother and the baby. And money is also needed for the baby upkeep after birth. You don't want to bring a child to this world and allow him/her to suffer from lack of any sort.
The availability of all these things provide the perfect preconditions for a woman to get pregnant. Anything short of these, nah, don't even try it.