Not graded
Companion’s words (mawquf) Musnad Ahmad 516
حَدَّثَنَا حَسَنُ بْنُ مُوسَى حَدَّثَنَا أَبُو هِلَالٍ حَدَّثَنَا قَتَادَةُ أَنَّ عُثْمَانَ قُتِلَ وَهُوَ ابْنُ تِسْعِينَ سَنَةً أَوْ ثَمَانٍ وَثَمَانِينَ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ahmad (No. 516).