تَوَلَّدَ سَنَةَ إِحْدَى وَسَبْعِينَ وَأَرْبَعِ مِائَةٍ، وَتُوُفِّيَ سَنَةَ سَبْعٍ وَثَلَاثِينَ وَخَمْسِ مِائَةٍ
He was born in 471 AH and died in 537 AH.
The dates belong to the Hijri lunar calendar; treating them as Common Era dates would distort the chronology. Their numerical difference is 66 lunar years, but the years alone do not establish the precise number of months or days lived.
Samarkand is mentioned as the place of death. A geographical surname derived from Nasaf and a death in Samarkand are distinct biographical details. A nisbah does not require residence in the same town throughout one's life.