Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:166Aḥmad b. Zayd > Ibrāhīm b. al-Mundhir > Sufyān > Jaʿfar b. Muḥammad from his father

[Machine] "Ali died when he was fifty-eight years old."  

الطبراني:١٦٦حَدَّثَنَا أَحْمَدُ بْنُ زَيْدٍ ثنا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ ثنا سُفْيَانُ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ قَالَ

«تُوُفِّيَ عَلِيٌّ وَهُوَ ابْنُ ثَمَانٍ وَخَمْسِينَ»  


See similar narrations below:

Collected by Bayhaqī
bayhaqi:12160Abū al-Ḥusayn b. al-Faḍl al-Qaṭṭān> ʿAbdullāh b. Jaʿfar > Yaʿqūb b. Sufyān > Yaḥyá b. ʿAbdullāh b. Bukayr > al-Layth b. Saʿd > Abū al-Aswad > ʿUrwah > Aslam

[Machine] Ali embraced Islam when he was eight years old.  

البيهقي:١٢١٦٠أَخْبَرَنَا أَبُو الْحُسَيْنِ بْنُ الْفَضْلِ الْقَطَّانُ بِبَغْدَادَ أنبأ عَبْدُ اللهِ بْنُ جَعْفَرٍ ثنا يَعْقُوبُ بْنُ سُفْيَانَ ثنا يَحْيَى بْنُ عَبْدِ اللهِ بْنِ بُكَيْرٍ حَدَّثَنِي اللَّيْثُ بْنُ سَعْدٍ حَدَّثَنِي أَبُو الْأَسْوَدِ عَنْ عُرْوَةَ قَالَ

أَسْلَمَ عَلِيٌّ ؓ وَهُوَ ابْنُ ثَمَانِ سِنِينَ