In CA you are a minor until 18
Yes they can.
both
sole custody
"16- and 17-year-old applicants" OR "sixteen- and seventeen-year-old applicants"
No
Only if the sixteen year old is emancipated.
None without a court order. see link
Yes it's perfectly legal.
Can à 17 year old move out
NO
Yes, it should be hyphenated like so: sixteen-year-old boys.
No, a sixteen year old can not legally move out on their own in Kentucky. Unless the sixteen year old is married or has parental permission they have to live with the parent until they are 18.