Yes
Yes
MOST rifles are- but you need to refine your question to get a meaningful answer- legal for WHAT?
50 cc is Legal on the street in KY.
VERY unlikely.
When you are 18.
yes
Yes, as of April 15, 2008.
12 years old
You have to be 18 in order to register a vehicle in Ky.
Ky was a Cincinnati Bengal's captain and holds the franchise record for most Special Teams tackles in a single season.
Yes, provided you do it in a safe and legal manner.