Shaykh Muhammad ibn Saalih al-'Utsaimin
Menstrual age is usually between 12 and 50 years. And the chances of a woman already getting your period before age 12 years, or still get your period after the age of 50 years. It all depends on the conditions, environment and climate that influence it.
The scholars, may Allaah have mercy, different opinions about whether there are definite limits to menstrual age, in which a woman does not get your period before or after that age?
Ad-Darimi, after mentioning the differences of opinion in this matter, said: "This is all, in my opinion, wrong. Therefore, the reference is to the presence of blood. Whatever it is, in condition however, and at any age, blood was shall be judged as menstrual blood. And only Allah the Most Knowing "[Al-Majmoo 'Syarhul Muhadzdazb, Juz I, p.. 386].
Ad-Darimi opinion this is a right and a choice of Shaykh al-Islam Ibn Taymiyyah. So, whenever a woman's menstrual blood get mean she menstruated, although not yet reached the age of 9 years or over 50 years. Because, Allah and His Messenger laws relate to the presence of menstrual blood, and not to provide certain age limit. Thus, in this matter, shall refer to the presence of blood that had relied upon the law. The restriction whereas none of the arguments that demonstrate this.
[Copied from the book of Minutes Fid Dimaa 'Ath-Thabii'iyah Lin-Nisa' by Shaykh Muhammad bin Salih Al 'Uthaymeen, with the Indonesian edition of Blood Habit for Women, published by Dar al-Haq, Mohammad Yusuf Penrjemah Aaron, Ma]