C++ program to calculate the age of human by entering data of birth

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

int main(void)
{

    int dd,mm,yy,dd1,mm1,yy1;
    int d,m,y;
    int dd2,mm2,yy2;

    std::cout<<"Enter the current day = ";
    std::cin>>dd;
    std::cout<<"Enter the current month = ";
    std::cin>>mm;
    std::cout<<"Enter the current year = ";
    std::cin>>yy;
    std::cout<<"Enter the birth day = ";
    std::cin>>dd1;
    std::cout<<"Enter the birth month = ";
    std::cin>>mm1;
    std::cout<<"Enter the birth year = ";
    std::cin>>yy1;

    if(dd1 <= dd && mm1 <= mm || yy1 <= yy)
    {
        d = dd-dd1;
        m = mm-mm1;
        y = yy-yy1;
    }

    if(dd1 <= dd && mm1 > mm && yy1 < yy)
    {
        d = dd-dd1;
        mm2 = mm+12;
        m = mm2-mm1;
        y = yy-yy1-1;
    }

    if(dd > dd && mm1 < mm && yy1 < yy)
    {
        if(mm == 1 || mm == 3 || mm == 5 || mm == 7 || mm == 8 || mm == 10 || mm == 12)
        {
            dd2 = dd+31;
            d = dd2-dd1;
            m = mm-mm1-1;
            y = yy-yy1;
        }
        if(mm == 2 && yy%4 == 0)
        {
            dd2 = dd+29;
            d = dd2-dd1;
            m = mm-mm1-1;
            y = yy-yy1;
        }
        if(mm == 2 && yy%4 != 0)
        {
            dd2 = dd + 28;
            d = dd-dd1;
            m = mm-mm1-1;
            y = yy-yy1;
        }
        if(mm == 4 || mm == 6 || mm == 9 || mm == 11)
        {
            dd2 = dd+30;
            d = dd2-dd1;
            m = mm-mm1-1;
            y = yy-yy1;
        }
    }

    if(dd1 > dd && mm1 >= mm && yy1 < yy)
    {
        if(mm == 1 || mm == 3 || mm == 5 || mm == 7 || mm == 8 || mm == 10 || mm == 12)
        {
            dd2 = dd+31;
            d = dd2-dd1;
            mm2 = mm+12-1;
            m = mm2-mm1;
            y = yy-yy1-1;
        }
        if(mm == 2 && yy%4 == 0)
        {
            dd2 = dd + 29;
            d = dd2-dd1;
            mm2 = mm + 12-1;
            m = mm2-mm1;
            y = yy-yy1-1;
        }
        if(mm == 2 && yy%4 != 0)
        {
            dd2 = dd+28;
            d = dd2-dd1;
            mm2 = mm + 12 -1;
            m = mm2-mm1;
            y = yy-yy1-1;
        }
        if(mm == 4 || mm == 6 || mm == 9 || mm == 11)
        {
            dd2 = dd+30;
            d = dd2-dd1;
            mm2 = mm+12-1;
            m = mm2 - mm1;
            y = yy-yy1-1;
        }
    }

    std::cout<<"The days are = "<<d<<std::endl;
    std::cout<<"The months are = "<<m<<std::endl;
    std::cout<<"The years are = "<<y<<std::endl;

    return 0;
}

Enter the current day = 7
Enter the current month = 1
Enter the current year = 2016
Enter the previous day = 7
Enter the previous month = 7
Enter the previous year = 1982
The days are = 0
The months are = 6
The years are = 33