Javascript code for Age calculator chatbot

var year;
var month;
var day;
var today = new Date();

console.log(Date());
Bot.send("Enter the year in which you were born");
var state = year;
async function respond(inputText) {
	if (state == year) {
		year = inputText;
		Bot.send("Enter the month in which you were born");
		state = month;
	}
	else if (state == month) {
		month = inputText;
		Bot.send("Enter the day");
		state = day;
	}
	else if (state == day) {
		day = inputText;
		if (month < today.getMonth()) {
			var age = today.getFullYear() - year;
			Bot.send("Your age is" + age);
		}
		else if (month > today.getMonth()) {
			var age = today.getFullYear() - year - 1;
			Bot.send("Your age is" + age);
		}
		else {
			if (day > today.getDay) {
				var age = today.getFullYear() - year - 1;
				Bot.send("Your age is " + age);
			}
			else {
				var age = today.getFullYear() - year;
				Bot.send("Your age is" + age);
				state = year;
			}
		}
	}

}