Age Calculator App using Vanilla HTML, CSS, and JS

What are you most proud of, and what would you do differently next time?

I'm proud that I managed to finish the project, and I will probably plan my projects better next time since I slacked off while working on this one.

What challenges did you encounter, and how did you overcome them?

My main challenge other than calculating dates, was motivation because of other priorities that I needed to do. I overcame these challenges by trying different methods and just forcing myself respectively.

What specific areas of your project would you like help with?

Feedback for any areas that can be improved is be greatly appreciated :)