How to add more user input to file in java

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Java

I'm pretty new to Java and I'm trying to figure out how I can update a text file with user input. I first make the file with some input and that works but I'd like to update the file with more input.

Thanks so much!

What I have tried:

I tried asking a user for their name and age and I then was able to save in a file but not sure how I can add new users and information to the existing userAge.txt file.

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;

class Main{  
    public static void main(String args[]){  
        Scanner scan = new Scanner(System.in);
        System.out.println("Name: ");
        String name = scan.next();
        System.out.println("Age: ");
        int age = scan.nextInt();
        System.out.println("Name:" + " " + name + " " + "Age:" + " " + age);
        scan.close();

        try{
            File file = new File("userAge.txt"); 
            PrintWriter writer = new PrintWriter(file);
            writer.write(name + " " + age);
            writer.close();
        } catch(IOException e){
            e.printStackTrace();

        }
        

    }  
}