Sasuke was 9 when he witnessed the murdering of his clan, because [Explaning this because I had to figure this out in my head] Itachi was 14 when he murdered his clan, he was 18 at the start of the anime (or where he came in, at least) and 21 when he died. Sasuke is 5 years younger then Itachi, there for making him 9 when he was 14, 13 when he was 18, and 16 when he was 21.] Hopefully that not only helped with your question, but any fanfic writers out there having trouble with the time line can look at this, and be even a little more accurate.
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Well Sasuke doesn't have any feelings for anyone since his parents died but he does have a little feeling for Sakura
Ponyboy was 13, about to turn 14 during the book. His parents died 8 months before the novel takes place. So, he was 13 years old when his parents died.
His parents were killed right in front of him so yea he does know.
No. Sasuke's snake is dead.
I'm not really sure what your question is but, Sasuke is 12 in the first series and 15 in Shippuden.