QUICK JAVASCRIPT QUESTION.

Hello, I am making a program ins Java script that subtracts a date from the current date and outputs how many days you have lived, but it is not printing out in my HTML page.

here is the code:

HTML CODE:

	Todays Date and Time Is:
	The Birthdate You Entered Is:
	You Have Lived For:
	JAVASCRIPT CODE: function start() { n = new Date(); y = n.getFullYear(); m = n.getMonth() + 1; d = n.getDate(); document.getElementById("currentDate").innerHTML = m + "/" + d + "/" + y; return[y, m, d] } function middle() { b = new Date(); mString = window.prompt("Enter Month You Were Born (1-12): "); dString = window.prompt("Enter Day You Were Born (1-31): "); yString = window.prompt("Enter The FULL Year You Were Born: "); m = parseInt(mString); d = parseInt(dString); y = parseInt(yString); document.getElementById("birthdate").innerHTML = m + "/" + d + "/" + y; return [y, m, d] }