ArcticSong

Well, if we consider Equestria Girls, they're in high school, meaning their age can be from 14-18. Now, the Cutie Mark Crusaders are also in high school, and are probably 14-15. Meaning the Mane 6 should be older than them, and considering that Big Macintosh is also in high school and is older than Applejack, he can be 18, and the mane six will then be 17. Now, I think at the start of Season 1, they're 15 years of age, considering their small frame. As more seasons came, their age increases too. I think at the end of season 9, their age should be 25 or near. Not talking about the scenes with Luster Dawn, they're probably in their mid forties there. I think, Rainbow Dash is the youngest one of them, taking into account her childish nature and innocence (she seems more innocent than the others, even if it doesn't feel so), and then Twilight, who is at least 1-2 years elder than Rainbow, she's just a little small in size, I think. Then Rarity, who seems to be more or less 1 year older than Twilight, and then come Applejack and Pinkie Pie, because they seem older, Applejack being the most levelheaded and adult, and Pinkie is just Pinkie, but I feel she is elder than most, too. And lastly, Fluttershy. It's even shown in the series, when they get their cutie marks, Fluttershy is the only one that looks elder and kinda like a teen. And she herself says that she is one year older than Pinkie. And if we include Sunset Shimmer and Starlight Glimmer, Sunset's age seems to be equivalent to Fluttershy, cuz obviously she is older than Twilight a little. And Starlight, I have mixed feelings about her. When she's introduced, she seems to be the age of Rarity in season 1, but in season 5, the mane 6 have grown too. So she's probably Rainbow Dash's age. 

My top Favorite Songs are:

1. Flawless 

2. What my Cutie Mark is Telling Me

3. Theme Song

4. A True, True Friend

5. The Magic of Friendship Grows

6. Time to Be Awesome!

7. We got this Together!

8. Raise this Barn

9. Open up your Eyes

10. We'll Make our Mark!