مبتدئ وارجو المساعدة في هذا الكود وين الخطأ فيه

#include<iostream>
using namespace std;

void child();
void young();
void middleage();
void old();

int main()
{
    char input;


    cout<<"what is ur name? ";


    cin>>input;
    switch (input)
    {

           case 1:
                 {
                 child();
                 break;
                 }
           case 2:
                {
                 young();
                 break;
                 }
           case 3:
                {
                 middleage();
                 break;
                 }
           case 4:
                {
                 old();
                 break;
                 }
           default:
                   {
                   cout<<"You r too old";
                 break;
                 }


      }
      cin.get();

      system("pause");
      return 0;

}

void child()
{
     int age;
     cout<<"How old r u? ";
     cin>>age;
     if (age<=10 && age >0)
     cout<<"You r a child!!!";
} 

void young()
{
     int age;
     cout<<"How old r u? ";
     cin>>age;
     if (age<30 && age >10)
     cout<<"You r  young!!!";
} 

void middleage()
{
     int age;
     cout<<"How old r u? ";
     cin>>age;
     if (age<60 && age >=30)
     cout<<"You r middleage!!!";
} 

void old()
{
     int age;
     cout<<"How old r u? ";
     cin>>age;
     if (age<120 && age >=60)
     cout<<"You r  old!!!";
}