Ethical or not ethical?

I Plato, think that pregnancies coming from women at the ages of 40 and on are vulnerable and can easily have an abortion. However, Aristotle and I believe that abortion can be done in certain cases. We can’t forget that in my time (Greece), abortion was accepted but not ethical and that I’m not an expert in this topic.However, even though I sort of agree with abortion in certain cases, I believe that sex should be done only when you plan to have a baby. In my book named The Republic, I state this situation with a deeper meaning. But I reinforced that sex should only take place and be practice in certain ages of your life and when you planned to built a family. Therefore, I think abortion took place because the government thought that, that was the best way to get rid of huge amount of population. So the government took advantage of this situation to release them from a problem.Abortion is not to be called ethical but is allowed in certain situations such as: to young, too old or the family is too extended. That’s why I encouraged people to be less promiscuous and control themselves and their appetite of having sex to avoid pregnancies. Therefore, if they get pregnated in an early age the baby will have several problems such as deformation or mental illness so the best thing is to abort them. In some other cases such as the women being too old, 40 and on will be obviously in danger as well as the fetus. That’s why I thing abortion should be practice in certain cases.