✅ How can i fix this?

string ageInput;

Console.WriteLine("You must be 18 or older to continue:");
Thread.Sleep(1000);
Console.WriteLine("How old are you?: ");
ageInput = Console.ReadLine();
bool isAgeParsed = int.TryParse(ageInput, out int age);

if(!isAgeParsed){
  Console.WriteLine("The age must be a number!");
  return; // or continue, depends on the method logic
}

Console.WriteLine($"You are {age} years old.");
...

string ageInput;

Console.WriteLine("You must be 18 or older to continue:");
Thread.Sleep(1000);
Console.WriteLine("How old are you?: ");
ageInput = Console.ReadLine();
bool isAgeParsed = int.TryParse(ageInput, out int age);

if(!isAgeParsed){
  Console.WriteLine("The age must be a number!");
  return; // or continue, depends on the method logic
}

Console.WriteLine($"You are {age} years old.");
...

public MyClass {
  //region variables
  ...
  //endregion
  
  // example method
  public bool checkAge(){
  // logic for checking age, return true or false
  ...
  }
}
...

Main(...){
  MyClass instanceOfMyClass = new MyClass(); // or just = new();
  bool isAgeOkay = instanceOfMyClass.checkAge(); 
  if(!isAgeOkay){
    // quit program
  }
}

public MyClass {
  //region variables
  ...
  //endregion
  
  // example method
  public bool checkAge(){
  // logic for checking age, return true or false
  ...
  }
}
...

Main(...){
  MyClass instanceOfMyClass = new MyClass(); // or just = new();
  bool isAgeOkay = instanceOfMyClass.checkAge(); 
  if(!isAgeOkay){
    // quit program
  }
}