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
quran:56:17 –

There will circulate among them young boys made eternal  

They will be waited on by immortal youths, resembling young boys, never ageing;
القرآن:٥٦:١٧ –

يَطُوفُ عَلَيْهِمْ وِلْدَانٌ مُخَلَّدُونَ  

{يطوف عليهم} للخدمة {ولدان مخلدون} على شكل الأولاد لا يهرمون.