Age calculator app with React and Next.js

This was a tricky app to make. Especially with figuring out the proper algorithm required to convert the user's birthday into an age. The app is fully responsive and even has an animation that occurs when the user clicks on the submit button. I used a setInterval() that calls the setState() function every 30 milliseconds. Inside the setState(), it will continue to increment the state by 1 until it reaches the age of the user in months, years, or days. This is what creates the animation of the numbers in my app.