JavaScript dentro de una función regular

function Person() {
    this.name = 'Jack',
    this.age = 25,
    this.sayName = function () {
        // this is accessible
        console.log(this.age);

        function innerFunc() {
            // this refers to the global object
            console.log(this.age);
            console.log(this);
        }

        innerFunc();

    }
}
let x = new Person();
x.sayName();
SAMER SAEID