Javascript Boolean Operator Logical AND compare age

let myAge = 30;/*www .j  a v  a  2s  . c o m*/

if (myAge >= 0 && myAge <= 10) {
    console.log("myAge is between 0 and 10<br />");
}

if ( !(myAge >= 0 && myAge <= 10) ) {
    console.log("myAge is NOT between 0 and 10<br />");
}

if ( myAge >= 80 || myAge <= 10 ) {
    console.log("myAge is 80 or above OR 10 or below<br />");
}

if ( (myAge >= 30 && myAge <= 39) || (myAge >= 80 && myAge <= 89) ) {
    console.log("myAge is between 30 and 39 or myAge is between 80 and 89");
}