You have to be 17 and a half and compleated atleast year 10 of school
No, I did my boot camp with a guy who was in his 50's. Just don't expect to get any higher than sergeant or corporal.
18 years old with a high school degree
you have to be at least 18 but if your parents sign you can go in at age 17
17 requiring parental consent, 18 without