Yes, at 18 you are an adult.
No, a 14 year old cannot get married. They would have to wait until they are 16 and have parental permission.
Of-course they can!
Legally, no.
In most places in the world an 16 year old can marry a 20 year old. But it will require parental permission to do so.
Yes
No
Yes, with parental consent.
Yes he can.
Yes.
Nope
Not legally.
yes