For loop questions

Package Tony2;
Import Java.util.Scanner;
public class Day27 {
public static void Main (string[] args) {
System.out.println ("Please enter the 1th customer's Age:");
Scanner input=new Scanner (system.in);
int I=input.nextint ();
for (i=0;i<=9;i++) {
if (i>=1) {
System.out.println ("Please enter the" + (i+1) + "customer's Age:");
Scanner num=new Scanner (system.in);
int Num1=input.nextint ();
}
}

System.out.println ("The proportion under 30 years of age is:");
System.out.println ("30-year-old ratio is: \ n will not be calculated, pending development ... ");
}

}

For loop questions