I said to 'Urwa: How long did Allah's Apostle - (ﷺ) stay in Mecca? He said: For ten years. I said: Ibn 'Abbas says (that he stayed in Mecca) for thirteen years.

Ibn 'Abbas reported that Allah's Messenger (ﷺ) stayed in Mecca for thirteen years and he died when he had attained the age of sixty three years.

I was sitting with 'Abdullah b. 'Utba and there was a discussion about the age of the Messenger of Allah (ﷺ). Some of the persons said: Abu Bakr was older than Allah's Messenger (ﷺ). 'Abdullah said: Allah's Messenger (ﷺ) died when he was sixty-three, and Abu Bakr died when he was sixty-three and so 'Umar fell as a martyr when he was sixty-three. A person from the people who was called 'Amir b. Sa'd reported that Jabir had said: We were sitting with Mu'awiya that there was a discussion about the age of Allah's Messenger (ﷺ). Thereupon Mu'awiya said: Allah's Messenger (ﷺ) died when he had attained the age of sixty-three, and Abu Bakr died when he had attained the age of sixty-three, and Umar fell as a martyr when he had attained the age of sixty-three.

I asked Ibn 'Abbas how old was he when death overtook the Messenger of Allah (ﷺ). He said: I little know that such a thing is not known to a man like you who belong to his people. He said: I asked people about it but they differed with me, and I liked to know your opinion about it. He said: Do you know counting? He said: Yes. He then said: Bear this in mind very well that he was commissioned (as a Prophet) at the age of forty, and he stayed in Mecca for fifteen years; sometime in peace and sometime in dread, and (lived) for ten years after his migration to Medina.