为什么用户名二总是被跳过

我正在努力学习C++，无论如何我都在if语句上。

我编写了一个程序，询问两个用户的全名和年龄（虚构用户），它询问用户1的姓名和年龄，以及用户2的年龄，但不知何故，询问用户2的姓名被跳过，最终询问用户2年龄

为什么？

这是我的代码：

#include <iostream>
#include <string>
using namespace std;
int main()
{
    string usernameone;
    string usernametwo;
    int age1;
    int age2;
    //ask the users their name and age
    cout << "Hi may I know your full name ? : ";
    getline ( cin, usernameone, 'n');
    cout << "nHello " << usernameone << " May I know now whats your age ? : ";
    cin >> age1;
    cout << "Ok thanks for the information, now may I talk to the other user ? thanks.nn";
    cout << "Hello may I know your full name ? : ";
    getline ( cin, usernametwo, 'n');
    cout << "nHello " << usernametwo << " May I know now whats your age ? : ";
    cin >> age1;
    if(age1 < age2)
    {
        cout << "looks like " << usernameone << " is older than " << usernametwo;
    }
    else
    {
        cout << "ok " << usernametwo << " is older than " << usernameone;
    }
    if(age2 && age1 >= 100)
    {
        cout << "your both lying your age can't be 100 and above";
    }
    cin.ignore();
    cin.get();
    return 0;
}