Age reference (yearling)
+1| Good clue.
I know you're not into robbery and other such petty things;
Personality reference: He is by no means a "petty" character; he's very sweet in his posts genereally, and family oriented with his twin
0| Just because someone is sweet and family oriented, does not mean that they cannot also be petty. They are not mutually exclusive.
but I couldn't help but wonder, would you like to raid the candy store?
Fluff
We can go under the cover of night, when the streetlights are on-
Appearance reference: Cover of night = black. Streetlights actually was not really part of this.
-1| Most, myself included, interpreted the streetlights as being meaningful. You have to be really careful with what you add in, when giving coat-clues!
c'mon, we may as well just take a tiny peak through those windows!
Personality reference: peek through those windows = curiosity!
0| I had to think a lot about this one. But in the end, it was a 0. His profile says that he's inquisitive, not curious, and there's nothing in this clue to suggest his inquisitive mind - just that your character is suggesting that they peek through the windows (and not that it's something he would want to do, etc).
Total of 0. Fail for me.