Age calculator app using SASS/SCSS and HTML-based form validation

It was an interesting project (and a bit difficult to grasp, due to the counterintuitive nature of working with date objects in general).

I went with the approach based on HTML built-in verification methods, such as min, max and required, which I could handle accordingly in JS using the invalid event.

I would like to get some feedback on that approach, as well as hear some thoughts on the overall code performance and quality. Let me know of any best practices I could implement in future projects. 😊