[Essay] Correction of a text

[Anglika]

How many times have you posted this text????

[tareq10]

Originally Posted by Anglika

How many times have you posted this text????

How many times have you posted this text?

Nothing wrong, right now.

[baoyibao]

from: http://www.usingenglish.com/reference/idioms/

The following is an idiom I think might have some spelling mistakes? Maybe the words "they" should all be changed to "he" as regard to the word "someone"?
A fool at 40 is a fool forever
If someone hasn't matured by the time they reach forty, they never will.

Or, maybe I'm wrong, but it's my first time to encounter such sentence pattern: the subject of conditional subordinate clause is "someone" while the subject and the object of the sentence are "they" and "them" respectively.

A little bird told me
If someone doesn't want to say where they got some information from, they can say that a little bird told them.