how does every work javascript code example

Example 1: js every

const exams = [80, 98, 92, 78, 77, 90, 89, 84, 81, 77]
exams.every(score => score >= 75) // Say true if all exam components are greater or equal than 75

Example 2: javascript every

const age= [2,7,12,17,21];
age.every(function(person){
return person>18;
});  //false

//es6
const age= [2,7,12,17,21];
age.every((person)=> person>18);  //false