Build a Chronological Age Calculator Using JavaScript (Beginner Friendly)

Calculating age might seem simple, but when you break it down into years, months, and days, it becomes a great beginner project to practice JavaScript. In this tutorial, we’ll build a chronological age calculator step by step. 🧠 What is a Chronological Age Calculator? A chronological age calculator is a tool that calculates the exact age of a person based on their date of birth. It returns: Years Months Days ⚙️ Step 1: Get User Input First, we need to get the user's date of birth: Calculate 💻 Step 2: JavaScript Logic Now let’s write the function: function calculateAge() { const input = document.getElementById("birthdate").value; const birthDate = new Date(input); const today = new Date(); let years = today.getFullYear() - birthDate.getFullYear(); let months = today.getMonth() - birthDate.getMonth(); let days = today.getDate() - birthDate.getDate(); if (days < 0) { months--; days += 30; } if (months < 0) { years--; months += 12; } document.getElementById("result").innerText = ${years} y