C++ program to input age in years and display age in days and months:

 C++

#include <iostream>

using namespace std;

int main() {
  // Declare variables
  int age_years, age_days, age_months;

  // Get the age in years from the user
  cout << "Enter your age in years: ";
  cin >> age_years;

  // Calculate the age in days
  age_days = age_years * 365;

  // Calculate the age in months
  age_months = age_years * 12;

  // Print the age in days and months
  cout << "Your age in days is: " << age_days << endl;
  cout << "Your age in months is: " << age_months << endl;

  return 0;
}

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To run this program, you can save it as a .cpp file and compile it using a C++ compiler. For example, on Linux or macOS, you can use the following command to compile the program:

g++ -o program program.cpp

Once the program is compiled, you can run it by typing the following command:

./program

For example, if you enter 20 as the age in years, the program will print the following output:

Enter your age in years: 20
Your age in days is: 7300
Your age in months is: 240

I hope this helps! Let me know if you have any other questions.