So I always believed that Mannimarco just over 1,100 years old (as of Oblivion) as he was said to have been a student of the Psijiic Order in the year 2E 230 (Mannimarco, King of Worms). But I recently read "Where Were You When The Dragon Broke?", a book dealing with the Dragon Break of the first era that took place during the 13th to 23rd centuries of the era. In it Mannimarco says "As for myself, I was here and there and here again, like the rest of the mortals during the Dragon Break".

This implies that he was alive during this time, placing his birth at the very latest during the 23rd century (1E 2200 - 1E 2299) and makes Mannimarco at least 1,950 years old by the time of Oblivion. This also means that by the time he was a student of the Psijiic Order he would have been over 850 years old, old even for an Altmer. Of course, I imagine he would have began studying earlier than 2E 230 and that a Psijiic is considered a student for a very long time. Please remember that all these calculations are a bare and unrealistic (as it assumes that he was not even a year old when the Dragon Break ended) minimum.

So I just thought I would share this information with the people on this forum and if you have any information to add or if you would dispute this information then by all means lets get this topic flowing.

The Dragon Break is not one event but several events where linear time waved bye bye. "Where Were You When the Dragon Broke?" refers to the most recent Drago Break which occured in the 3rd era most commonly called "The Warp of the West"
Mannimarco speaks of The http://www.uesp.net/wiki/Lore:Yagrum_Bagarn