Advanced age and fertility as a sign of God's power

قَالَ أَبَشَّرْتُمُونِى عَلَىٰٓ أَن مَّسَّنِىَ ٱلْكِبَرُ فَبِمَ تُبَشِّرُونَ

He said, "Have you given me good tidings although old age has come upon me? Then of what [wonder] do you inform?"