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It has been stated that he is a being with no end.
Immortality: Fate's body is pure force when he wills it to, making him unaffected by the death field. Enhanced Physique: Even without his magical powers, Kent is still physically superior to any normal human. However, he would eventually die due to aging and the mantle of Doctor Fate would be passed to many others. The two helped each other and eventually Kent would become a superhero - becoming a member of DC’s first superhero team - the Justice Society. Upon returning to America, he would meet Inza Cramer - his wife and later successor. Nabu spend years training Kent, allowing him to withstand the effects of wearing the helmet (considering the amount of power it wields - it can put a huge strain on the human body), When Kent and Nabu merged, they became Doctor Fate. Taking pity on young Kent (mostly because his father’s death was Nabu’s fault and well he planned everything), Nabu decide that he would train Kent in the ways of magic and sorcery so that he would become the defender of the earth. Now let’s go back to the present, Sven and Kent accidently released Nabu which caused a poisonous gas to appear which led to the death of Sven Nelson. However, like brothers they fought over millennia with Nabu eventually decided to go to Earth in order to fight the Lord of Chaos though he was drained during his many battles and resides in that Pyramid. The Lords of Order were first created alongside the Lord of Chaos.
However, in that tomb wasn’t aliens but rather the remains of Nabu - the Lord of Order. He brought his son with him on the expedition (which you would think a father would not do considering how dangerous pyramids can be).
With his father Sven being an archaeologist who firmly believed that the pyramids in the Valley of Ur were built by aliens. Born as Kent Nelson, his life was anything but normal.