Heeeeyyyy, everybody! It's Meester Tweester! The Hurt\Heal fanfic, now known as Epic Pony War, is still hard in development. I apologize for what has now been a nine month wait, but character development is very important to me. I'm really hyped to reinterpret the ponies, but an issue has come up with the ages.
I thought the show followed the aging of horses in real life, with foals being below one year, yearlings being one year, colts and fillies being two to three years, and mares and stallions being four years or older. While rewatching For Whom the Sweetie Belle Toils, SB explicitly explains her fifth birthday, which would clearly be in the adult range if like real life. So, do ponies age like humans?
Some helpful insight from creator Lauren Faust: