When is it too late for the clock?

Okay, I recently had this big argument with my sister in law about when is it the "right" age to have a baby. She, having just gotten married at the age of 28, got pregnant. She said that she was really afraid of having a baby well into her 30s because most women have their children well before they hit 35. I argued that it's pretty common for many women especially those concentrating on their careers to delay having a baby at all. While it is still very common for women to have their first child before 35, I told her why should those who plan to have a kid later in life, be looked upon strangely. Or, put it more bluntly, have some "problem" with fertility. Granted, we all have a finite amount of eggs in our basket, but isn't 34 still a viable age to have a child, or is it too late? When is the right age, then? 28, 32, or 34?