Were you reading a fanfic? Because I don't recall JK Rowling ever mentioning this.
On Dudley's birthday, Harry is 10, but shortly after he turns 11
Harry didn't receive any birthday cards from his friends and thought they had forgotten about him, in fact Dobby had simply prevented Harry from getting his letters. The Dursley's were also completely ignoring it.
In the summer preceding Harry Potter and the Prisoner of Azkaban, Harry turns 13 years old. Throughout this book he is 13.
yes and his eldest kid turns out to be like harry
Because in Harry Potter and the Deathly Hallows it turns out that Professer Severus Snape was a incredibly brave man so Ginny and Harry named their kids Albus(after Dumbledore) Severus(after Snape)
On Dudley's birthday, Harry is 10, but shortly after he turns 11
Harry Potter turns 15 in the 5th book, its a rather easy system really, all of the books start arround the same time of year, starting when hes eleven and progressing one year each book, harry turns 11 in the first book, 12 in the second, 13 in the third, and so on and so forth.
throughout the books harry potter turns to his friend Hermione Granger for information.
Scabbers is revealed as Peter Pettigrew in Harry Potter and the Prisoner of Azikaban.
Harry didn't receive any birthday cards from his friends and thought they had forgotten about him, in fact Dobby had simply prevented Harry from getting his letters. The Dursley's were also completely ignoring it.
The only anamagi in the Lego Harry Potter years 1-4 are Sirius (who turns into a dog) and Lupin (who turns into a werewolf).
In the summer preceding Harry Potter and the Prisoner of Azkaban, Harry turns 13 years old. Throughout this book he is 13.
He is 16 at the very beginning, and he turns 17 before Bill and Fleur's wedding.
yes and his eldest kid turns out to be like harry
No, Harry dies, but comes back to life because it turns out that he is a horcrux.
Severus Snape was the Half-Blood Prince.
Because in Harry Potter and the Deathly Hallows it turns out that Professer Severus Snape was a incredibly brave man so Ginny and Harry named their kids Albus(after Dumbledore) Severus(after Snape)