The exact date of her birth is not recorded in the books of history and biographies. However, according to my research, I place her birth somewhere between the years 51 to 53 A.H. I reached this conclusion after studying a number of sources. Amongst that which lends support to this opinion:
It has been said that he passed away in 114 A.H, or 116 A.H, or 117 A.H, or 118 A.H.
Sayyidah Fatimah bint Hussain rahimaha Llah lived until his demise making the date of her demise one of these dates or sometime thereafter.
Analysis: The sources which put her demise at 110 A.H are far from correct—as our respected reader would have surmised—especially when all the sources say she passed away at the age of 70 or more. Thus, if we were to assume that her age at demise was 70, and her date of birth—as I have calculated—somewhere between 51-53 A.H, then the date of her demise —at the earliest—would be 120 A.H.
As for those sources that put her demise at 117 A.H, these are more accurate as they are closer to the age 70.
She was [in all probability] 50 or 55 years old at that time. The incident between Sayyidah Fatimah bint Hussain rahimaha Llah and Dahhak most probably took place in the beginning of Yazid ibn ‘Abdul Malik’s Caliphate, i.e. 101 A.H.
A person may object to this reasoning saying that one would still be desirous of marrying the Ahlul Bayt though they may be aged or not strikingly beautiful; however, this will still hold no weight before our other assessments which is confirmed by the books of history and other sources as well.
Fatimah bint Hussain passed away during the Caliphate of Hisham ibn ‘Abdul Malik.
The Caliphate of Hisham ibn ‘Abdul Malik was from 105 A.H-125 A.H. this supports what I have explained previously.
 Amongst them is Ibn Hibban: Tabaqat al Atqiya’, Al Yafi’i: Mir’at al Jinan. Both these references were mentioned by ‘Umar Rida Kahalah in A’lam al Nisa’, 4/47.
 Amongst them is Ibn ‘Asakir: Tarikh Dimashq, 20/74. His biography of Fatimah bint Hussain rahimaha Llah is more detailed than all other authors.
 Al Thiqat,5/301.
 Tahdhib al Tahdhib, 12/443.
 The incident will be quoted in detail later on in the book.
 Ansab al Ashraf, 8/243.
 Tarikh Dimashq, 74/15.