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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
hakim:6103 – Abū Bakr Muḥammad b. Aḥmad b. Bālawayh > ʿAbdullāh b. Aḥmad b. Ḥanbal from my father > Nūḥ b. Yazīd > Ibrāhīm b. Saʿd

[Machine] "Abu Abdullah said, 'Saad embraced Islam when he was nineteen years old.'"  

الحاكم:٦١٠٣ – حَدَّثَنَا أَبُو بَكْرٍ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ بَالَوَيْهِ ثَنَا عَبْدُ اللَّهِ بْنُ أَحْمَدَ بْنِ حَنْبَلٍ ثَنَا أَبِي ثَنَا نُوحُ بْنُ يَزِيدَ ثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ قَالَ «تُوُفِّيَ سَعْدُ بْنُ أَبِي وَقَّاصٍ فِي زَمَنِ مُعَاوِيَةَ بَعْدَ حَجَّتِهِ الْأُولَى وَهُوَ ابْنُ ثَلَاثٍ وَثَمَانِينَ سَنَةً» قَالَ

أَبُو عَبْدِ اللَّهِ «وَأَسْلَمَ سَعْدٌ وَهُوَ ابْنُ تِسْعَ عَشْرَةَ سَنَةً»  

See similar narrations below:

Collected by Suyūṭī