Silsilah Sahihah

It is narrated from Sayyiduna Miqdad (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "If a man dies before the completion of his creation (i.e., in an incomplete state) or after reaching extreme old age, and people are (generally) between these two ages, (in any case, on the Day of Resurrection) he will be raised as a young man of thirty years of age. If he is among the people of Paradise, he will be in the form of Adam (peace be upon him), in the appearance of Yusuf (peace be upon him), and with the heart of Ayyub (peace be upon him). And if he is among the people of Hell, his body will be made as great and massive as a mountain."