﴿ قَالَ رَبِّ إِنِّى وَهَنَ ٱلْعَظْمُ مِنِّى وَٱشْتَعَلَ ٱلرَّأْسُ شَيْبًۭا وَلَمْ أَكُنۢ بِدُعَآئِكَ رَبِّ شَقِيًّۭا ﴾

“he prayed: "O my Sustainer! Feeble have become my bones, and my head glistens with grey hair. But never yet, O my Lord, has my prayer unto Thee remained unanswered.”

Please check ayah 19:6 for complete tafsir.