There was a MLP episode called “Cutie Mark Chronicles”.
 
Basically it was the episode that shows on how the Mane 6 got their Cutie Marks.
 
Spoiler alert: Rainbow Dash flew so fast she gave all her friends puberty XD
 
 
I watched this episode way back in Summer 2011, when I got into the MLP fandom. As I was watching this, I realized on how different Fluttershy looked compared to the other Mane 6 as fillies. Her legs are much longer and she was lanky, and her wings had four feathers instead of three like Rainbow Dash and other Pegasus fillies and colts.
 
Could this mean Fluttershy is the oldest one in the group?
 
Well, in one episode Pinkie Pie said she was her “Auntie Pinkie” and Fluttershy replied with “I’m a year older than you”.