Talk:Prophet Muhammad (s)
In the text we have: "However, taking into consideration that the Prophet's (s) demise was in 632 CE, and that he was 63 years old at the time of his death, the year of his birth must have been either 569 or 570 CE."
But it seems that the date is not correct. Prophet's age was 63 if he was 40 at the bi'tha, yet we do not have the explicit report affirming whether he (s) was in the 40th year of his life or had finished it.
However we can deduce two dates according to these two theories. If he was 41 years old (i.e. passed 40 years of his life) at bi'tha his birth would be May 1, 571 CE; and if he was 40 (i.e. passed 39 years of his life) at bi'tha his birth would be April 19, 572 CE.
On the other hand you would see some so-called authentic encyclopedias mentioning strange dates:
"Mhammad, in full Abū al-Qāsim Muḥammad ibn ʿAbd Allāh ibn ʿAbd al-Muṭṭalib ibn Hāshim (born 570, Mecca, Arabia [now in Saudi Arabia]—died June 8, 632, Medina)."
- Encyclopedian of Islam
Muhammad's biographers usually make him 40 or sometimes 43 years old at the time of his call to be a prophet, which, taken with the statements on the length of the Meccan and Medinan periods of his prophetic activity and his age at the time of his death, would put the year of his birth at about 570 A.D. (Encyclopedian of Islam, vol. 7, p. 361)