Really nice breakdown. I actually built a similar chronological age calculator recently, and it was interesting how something that looks simple on paper becomes tricky once you deal with real date logic (months, leap years, edge cases, etc.). Your JavaScript example explains the core idea very clearly — especially the way you handle months/days adjustments. This is exactly the kind of project that helps beginners understand real-world date manipulation instead of just theory. I’ve been exploring more utility-based projects like this to strengthen fundamentals, and this is a great reference. https://chronoagecalculator.com

Really relatable. I also felt this while building small tools like a chronological age calculator (Try Here: https://chronoagecalculator.com/) that even simple systems hide a lot of underlying logic and edge cases once you go deeper. Your points on context, stateless models, and post-training cleared a few misconceptions I also had. Makes me want to revisit ML fundamentals with a more practical lens.