Hadith 6163
Abu Sa'id reported God's messenger as saying, "Al-Hasan and al-Husain will be the chief ones among the youths[*] who go to paradise." *Mirqat, 5:604, indicates that the meaning is not easy to decide. One suggestion is that shabab (plural of shabb) which means "youths" is used in the same sense as fatan (young man) when it means a brave warrior without any particular indication of age. A less likely suggestion is that the words refer to all those who go to paradise, apart from prophets and the four rightly-guided Caliphs, because all the inhabitants of paradise will be young. Another suggestion is that the words refer to those who were young when the Prophet spoke them. Tirmidhi transmitted it.
وَعَنْ أَبِي سَعِيدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْحَسَنُ وَالْحُسَيْنُ سَيِّدَا شباب أهل الْجنَّة» . رَوَاهُ التِّرْمِذِيّ