JavaScript program to take birth year and tells age

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Following program shows you how to take birth year and tells age.
In this program we get birth year from user and tells their age using currentYear - birthYear

var birthYear  = prompt("Please enter your date of birth:");
var age = new Date().getFullYear() - birthYear;
 console.log("Your age is " + age);

Output:

Please enter your date of birth:
1990
Your age is 28
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