Surah Al-Hijr 15:54

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?"

Translation: Saheeh International

Tafsir

He said ‘Do you give me good tidings of a boy when old age has befallen me?’ ‘alā an massaniya l-kibaru is a circumstantial qualifier in other words despite the fact of its having befallen me? So of what thing do you give me good tidings?’ an interrogative meant to indicate amazement.

Excerpt from Tafsir al-Jalalayn, commentary on 15:54, via Quran.com. The reader has the full commentary and 9 more tafsirs.