Ok so i have a few things.
Application: ehhh, it was decent, it could've been better. It was lacking a few things. It needs to be INTERESTING! I was bored while reading it, thats not a good sign.
InGame: I have no clue what you're like on the server, or how you treat the community. So i can't judge you on this.
Age/Maturity: Now i know this is aggravating, but you're only 13! I know what its like in your position, trust me. I applied for staff over and over again when i was 12-13 and truth be told i wasn't ready, i may have not known it at that time but its the truth. People point out your age for a reason. Although you seem more capable of this position then most other 13 year olds i don't think you're quite ready yet.
My Advice: As a long time meepcrafter i know how this stuff works. Taking on a role of the staff team is a big time consumer, its more work than you think. Its a serious commitment, and commitments are hard at your age, trust me. TAKE ADVICE FROM EVERYONE. Thats big. If you don't get it this time keep your head up, Learn from your mistakes, always keep moving forward, because eventually you"ll get there.
I'll give you -0.5 Im interested to see how staff handles this. Best of luck to you!