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.
yes
When you are 18.
Yes, as of April 15, 2008.
12 years old
You have to be 18 in order to register a vehicle in Ky.
Yes, provided you do it in a safe and legal manner.
Ky was a Cincinnati Bengal's captain and holds the franchise record for most Special Teams tackles in a single season.