Aristotle say that ethics is or is NOT a precise science

1. In Book 1, Section 3, does Aristotle say that ethics is or is NOT a precise science? What are the reasons for his answer? 2. Also in Book 1, Section 3, why does Aristotle claim that a young person is unlikely to be as good at ethics as an older one? Do you agree with him? 3. In Book 1, Section 7, what does Aristotle is the main purpose or goal for which all human beings strive? Do you agree with him?