sorry if it's a bit hard to follow, but each image has a year, and that's how flint came to be what he looks like today

Notes:
1. a ref? of what he could have looked like back in 2003:
https://www.furaffinity.net/view/7000082/
2. it's going by Year/Month on the pictures, so you know

3. A better timeline for what comes after has been made.