I think that you should probably think about indenting your code a little, so that the various blocks are a bit easier to pick out.

Also, I think that it's generally best to have main() return int rather than void , that way you can check the return value of the program and see if everything went as expected.

So, your code properly formatted, with some other little bits corrected:

#include<iostream>      /* Removed the ".h" from the header name, it's deprecated in C++ */
#include<conio>         /* Same for this one */

/* Added a line to use the std namespace, otherwise you'd have to use std::cout & std::cin instead of cout & cin */
using namespace std;

int main()   /* Changed the return-type to int */
{
   /* this code is now indented, so that we know it's in main() */
   int birthmonth,birthyear;
   int currentmonth,currentyear;
   int agey,agem;
   
   /* Adding carriage returns between distinct blocks of code can aid readability */
   cout << "\n\n\t\t\tRaje\'s Age Calculator\n\n";   /* Used "\'" instead of just "'", since this will cause an error */
   cout << "Enter Your Birth Year(Eg:1989):";
   cin >> birthyear;

   /* Added some white space between the elements of these statements to aid readability */
   cout << "\n\nEnter Your Birth Month(Eg:7):";
   cin >> birthmonth;

   /* Added this bit to demonstrate return values from main */
   if(birthmonth > 12 || birthmont < 1)
      return 1;   /* return 1 when something's gone wrong */
      
   cout << "\nEnter The Current Month(Eg:7):";
   cin >> currentmonth;

   cout << "\nEnter The Current Year(Eg:2010):";
   cin >> currentyear;

   agey = currentyear - birthyear;
   agem = 12 - birthmonth;

   cout << "\n\n\t\tYour Age is " << agey << " Years And " << agem << " Months ";
   
   getch();
   return 0;    /* We now return "0", so that we can check from another program if this one finished OK */
}

iam using Dev-C++ Its Working Like a Charm

#include<iostream>
#include<conio.h>

using namespace std;
int main()
{
int birthmonth,birthyear;
int currentmonth,currentyear;
int agey,agem;
cout<<"\n\n\t\t\tRaje's Age Calculator\n\n";
cout<<"Enter Your Birth Year(Eg:1989):";
cin>>birthyear;
cout<<"\n\nEnter Your Birth Month(Eg:7):";
cin>>birthmonth;
cout<<"\nEnter The Current Month(Eg:7):";
cin>>currentmonth;
cout<<"\nEnter The Current Year(Eg:2010):";
cin>>currentyear;
agey=currentyear-birthyear;
agem=12-birthmonth;
cout<<"\n\n\t\tYour Age is "<<agey<<" Years And "<<agem<<" Months ";
getch();
}

@hayzam take some time and read the post from ravenous. there is plenty to be learned there.

I definitely agree with ravenous in that an organized source is always best for you or anyone else working with the code. Otherwise a very good, precise age calculator.

I think you should taken current year and current month and same day using Computer time with help of header file because most user want program is made in such way which only gives output without more or unnessary input.

Thanks Man

thanks to give calculator code but it shows error