there is one factor you didn't put in this theory of yours, and that is the Apple Family Reunion. In the episode Granny Smith CLEARLY states that the Family Reunion is once every 100 moons, moons meaning by months since one moon is one full moon cycle. So, with that said, 100 moons would be 8.3- years, now, in the episode it is also Apple Bloom's FIRST Family Reunion, so, that would place her at the age of 8-9, but, if your age for the mane 6 in Cutie Mark Chronicles is correct then Applejack would only be 18 years of age, and then you said it would go Rarity, meaning her to be 17, Fluttershy and RD to be placed at 15, Pinkie to be at 14, and Twilight to be 13, so, if you could take into consideration of this new evidence of the mane 6's actual age, what do you think? I couldn't sleep last night so i was reading this, i thought it was well built and had a good foundation, until i found the contradiction