One moment I have to close the page I put inside the function the function that I already designed put(text) to see the function Person execute. 

        function Person() {

            this.age =0;

            setInterval(()=>{

                this.age++;

                put(this.age); // this proplerly refers to the person object

            }, 1000);

        }

        const p = new Person();

Rute Bezerra de Menezes Gondim