I am 13-19 years old, take a guess. I like to give out DL links to stages and models, so check the DL part of my gallery frequently. I am no MMD expert, but I can at least help answer some of your questions. I eventually will post up some tutorials for newcomers to MMD.
My Favorite Vocaloids (In order):
1. Neru+Nero (shhh they totally count)
2. Meiko
3. Piko
4. Tonio
5. Ryuuto
6. Rion
7. Lily
8. Iroha
9. CUL
10. Miriam
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And the pairings that I like (In no order):
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