Liu Chi-hong emphasizes that every woman's reproductive capacity is different, but typically five years before it ends their periods will start to become irregular, and their fertility would have begun to drop markedly about four or five years before this irregularity.
劉志鴻更強調，每名婦女的生育能力縱有個別差異，但通常在停經的前 5 年，月經週期就會開始混亂，而生育力急遽下降的時間，更早在月經混亂前的四、五年就開始。