Where does it get Dracula was 412 from? The book never gives a specific age. If we go by Vlad III, 412 years from his birth would place the book in 1843. The book is actually most likely set in 1893 (based on how dates line up), and definitely in the 1890s.
I don't think Sauron's purported age is correct either, not a Tolkien geek but iirc it's more in the 5000 ballpark. So I assume all numbers in this post are incorrect and exist solely for comedic effect.
Not sure about Cthulhu either, and I've read all Lovecraft.
If I recall correctly, all Maiar (of which sauron is one) were created by Eru before time was countable, i.e. "in the beginning". Once valinor and the two trees were created, time was counted by "the years of the trees" which were each approximately 10 of our years, and several thousands passed before the end of the First Age (and then of course the second and third ages happened). I assume someone did the appropriate conversion and got the number from there. It seems reasonable to me.
Plus, once you're old enough to pour your cruelty, malice, and will to dominate all life into some jewelry, you stop counting the years, don't you?
Is it too early for me to inspire madness in the minds of men?
It seems you have been slumbering, it seems madness in men is innate.
It is the time for you to inspire madness in the minds of the gods.
Nightmare dreams no mortal mind could hold.
