Responsive Age Calculator with Select elements and hovers

Halfway through I noticed that it was supposed to be inputs instead of selects, but I thought it would be cool if I did with it instead, more challenging, etc.

This forced me to go through a path not predictable, some things didn't need to happen since I did this, and instead of giving an error when I made a date in the future, I thought to myself that I would like to know how much time it would take for my anniversary in this year for example, so I did a little thing to this specific interaction and I think it turned out to be very cool! Had a lot of fun, my favorite project so far!