string/char input

I want to take input for name of a student ...
when i do char name[20]; and take input with cin>>name; it prints only upto 1st space like if i type "jimmy green" then it will print only "jimmy"

when i take string name; and try to input with getline(cin,name) then it prints the next line before the input like this

here is my code :

#include<iostream>
#include<string>
using namespace std;

struct student {
string name;
int age;
};

int main() {
int n;
cout<<"Enter the total no. of students : ";
cin>>n;

student s1[n];

for(int i=0;i<n;i++) {
cout<<"Student "<<i+1<<" : \n\t"<<"Name : ";
getline(cin,s1.name);
cout<<"Age : ";
cin>>s1.age;
}
}

And here is the output :


Enter the total no. of students : 3
Student 1 :
Name : Age :


You see that the "Age" is appearing before entering the "name" ... so how can i fix this problem ??????