It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The people of Paradise will enter Paradise hairless, beardless (youths), with kohl-darkened eyes, aged thirty-three years."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17254