Really, this is a legal question not an ethical or moral one. The reason is that not all babies survive until they can be born living. So, legally it’s impossible to say that a person is a legal person until he is living apart from his mother’s womb. This does not give carte blanche for abortion, however. Nor does it have anything to do with our real age. After all, many people who died one day before their next birthday are legally said to have died at the age they were one day before. What about all the months they lived up until that point? Legally they mean nothing in our method of determining legal age, but we wouldn’t say that it would have been all right to end that person’s life merely because he hadn’t reached his next birthday, now would we.