Wrong. They both descend from Elfhoney, the Aedra who shed their immortality to propagate Nirn. You do know that the Nine Divines aren't the only Aedra, don't you? Seriously, as an ES nerd, this is starting to get kind of annoying. Elves don't live a single thousand years, let alone several. Only the most versatile in arcane magic can, and in that case several men have lived thousands of years as well.
Yes I do know the nine aren't the ones. The spirit of Valenwood is one of them and the Bosmer are literally half Aedra as they still retain their shapeshifitng ability albeit with lesser control.
A large fragment of the Ehlnofey world landed on Nirn relatively intact, and the Ehlnofey living there were the ancestors of the Mer. These Ehlnofey fortified their borders from the chaos outside, hid their pocket of calm, and attempted to live on as before aka gods. Other Ehlnofey arrived on Nirn scattered amid the confused jumble of the shattered worlds, wandering and finding each other over the years. These Ehlnofey were ancestors of men.
Eventually, the wandering Ehlnofey found the hidden land of Old Ehlnofey, and were amazed and joyful to find their kin living amid the splendor of ages past. The wandering Ehlnofey expected to be welcomed into the peaceful realm, but the Old Ehlnofey looked on them as degenerates, fallen from their former glory. For whatever reason, war broke out, and raged across the whole of Nirn.
The Old Ehlnofey retained their ancient power and knowledge, but the Wanderers were more numerous, and toughened by their long struggle to survive on Nirn. This war reshaped the face of Nirn, sinking much of the land beneath new oceans, and leaving the lands as we know them (Tamriel, Akavir, Pyandonea, Atmora, and Yokuda). The Old Ehlnofey realm, although ruined, became Tamriel. The remnants of the Wanderers were left divided on the other three continents.
So the originality might be the same but only the Elves hold their godlike powers. Lore mentions elves can live some thousand years but Tamriel is unforgiving and they usually die before reaching a thousand but they CAN live that much.
What you read is wrong. And nonexistent.
I just love how you rage and jump to conclusions. Pretty sure you can read it from in-game books in Oblivion game.
Edit: Ayield magic users used their own soul until there was nothing left.