Javascript input - First and Second name and age + limits and submitting processing!

var firstName = document.getElementById("name1").value; //creates first name variable
var age = document.getElementById("age").value; //creates age variable
var secondName = document.getElementById("name2").value; //creates second name variable
Submitted = "true"; //submits data...
if (firstName.length > 15) { //unless if the name is longer than 15 characters
    alert("The name must have no more than 15 characters!") //for which you'll get an alert
    Submitted = "false"; //and your data won't be submitted
}
if (isNaN(age) || age < 10 || age > 120) { //or your age is below 10 or over 120
    alert("The age must be between numbers 10 and 120!") //for which you'll get an alert
    Submitted = "false"; //and your data won't be submitted
}
if (secondName.length > 15) //unless if the name is longer than 15 characters
    alert("The name must have no more than 15 characters!") //for which you'll get an alert
    Submitted = "false"; //and your data won't be submitted (again lol)
}
if (Submitted == "false") {  //if it isn't submitted...
    return false; //it doesn't do anything
}
//the end...