The Date of the Prophet's Death

There's ethnographic material that's been found recently in Saudi Arabia, which yields states such as 23, 24. The 23, 23 is after the prophet actually emigrated then from Mecca to Medina during his own lifetime. So that's maybe 10, 15 years after the death of the Prophet. That links it indirectly to the second caliph honor, the year when he died. And then there's 91 age. All the ones we're talking about had teeth material here.