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# Why this string was treated as an integer by JavaScript without the Parse method?

In the previous exercise (calculate your age in seconds) I add a prompt to ask the user for its age to customize the seconds depending ion the user. I didn't use the parse method, buy JavaScript convert the string prompt in to a Integer and gave the result. How is that possible? is it because the other variable that uses for the calculation is an integer?

Here's my code:

```//variables
var secondsPerMinute = 60;
var minsPerHour = 60;
var hoursPerDay = 24;
var DaysPerYear = 365.25;
//Seconds in a day
var SecondPerDay = secondsPerMinute * minsPerHour * hoursPerDay;
document.write("There are " + SecondPerDay + " seconds in a day.");
//Seconds in a Year
var SecondsPerYear = SecondPerDay * DaysPerYear;
document.write("There are " + SecondsPerYear + " seconds in a year. ");
//Living seconds of the user
var yourAge = prompt("How old are you?");
var livingSeconds = yourAge * SecondsPerYear;
document.write("You've been alive " + livingSeconds + " seconds. Wow!");
```

Hi Clara,

I believe this is part of the forgiving element of JavaScript if the user only enters a number JS will treat it as a number moving forward in the rest of the calculations where possible.

However its a best practise to include the parseInt() function for prompt entries that will later be manipulated as if the user enters anything other than a simple number your code will fail.

for example.

```var yourAge = prompt("How old are you?");

//where yourAge = simple number such as 8. --code works fine.
//if yourAge = a string such as "8 years" for example -- code will not work unless the parseInt("8 years") is run to give back parseInt(yourAge) = 8;
```

Hope that helps