How old were you when you could first name all the US Presidents?

[angus]

At least 47. 

[angus]

What other lists of world leaders can people name?

I could name all the Bundeskanzlers starting with Adenauer when I was a small child living in West Germany, but there were only about six of them at that time.  My father had received a proof set of silver two-mark pieces commemorating each one, and from that I learned them.

I had the names of all the Chinese dynasties down for a while, starting from the Xia (circa 2100 BC) till the last one (Qing, ending in 1911) but I've forgotten them. 

For a while I could remember the names of all the captains of warp-capable ships named Enterprise, but I've forgotten them as well.  Also, there's some debate as to Captain April's legitimacy.  Some Trekkies claim that the animated version is not canon.

[angus]

The states I learned about 10/11 the capitals I think I know most

Those I learned pretty young as well.  I think I could probably tell you the capital of each U.S. state by the summer of my fifth year.  That's the sort of thing my parents pressed me on at an early age.

I do that with my son as well.  He's 9 and probably could probably only name two presidents, Washington and Obama, but I'm sure he can tell you the capitals of all the states.

[angus]

OK, now those who could do so before 8 do scare me.

I'm fairly certain I could have done by then, but then the list was noticeably shorter than it is now.

I can name them up to Van Buren as well.