C# Windows Form; Redefining variable according to Text Box Error

Im new to coding and C# so sorry if this is a stupid question.

I need to redefine a variable according to a text box (user input) and I am getting an error

int age;
private void Age_TextChanged(object sender, EventArgs e)
   {
       //saves age in years
       age = Age_TextChanged.int;
   }

It is erroring on line "age = Age_TextChanged.int;" on the int bit

The error is as followed

Identifier expected; 'int' is a keyword

First off, what does this mean, secondly, how do I fix it?

Thanks in addvanced