Well it depends on what state you are in, I don't think it would be a problem in any state if you did not do any sexual activities, but if you were to do that you might want to check your states age of consent laws.
No
no
No
no it is not illegal four a 21 year old and a 16 year old to be going out.
No
lol yes
No. now to have sex with that 16 year old, depending on the country, is illegal
no it is not illegal. it would most likely only be illegal if the 16 year old turned 18 and the girl is still only 16 or 17.
No, it's legal.
Yes
No
It is illegal for a 16 year old to date a 28 year old man!