Is it legal for a 16 year old to have sex with a 35 year old?

Unless that person is your teacher or is otherwise in a position of authority, it is legal. That does not mean it is smart, for either of...

If im 16 and i get pregnant by a 21 year old but im going to be 17 (age of consent ) when everyone finds out can he go jail ?

Yes, he can. He should be talking with a criminal defense lawyer, now. It is the age when the sex happens that counts. See...

Is it illegal for a 16 yr old girl to date a 20 yr old boy?

It is not illegal. Dating is not regulated by law. Sexual Intercourse and Contact are. The age of consent in Ohio is 16. See...

Is it legal for a 17 year old to have sex with an 18 year old?

With consent, it is not illegal. See https://en.wikipedia.org/wiki/Ages_of_consent_in_the_United_States#Florida

Dating is legal, with parental consent. Sexual contact / intercourse is regulated by law and is illegal. See...

I am 13 about to be 14 and this boy is 14 about to be 15 is it illegal to date him ?

Dating is not controlled by law. Sexual conduct is. See https://en.wikipedia.org/wiki/Ages_of_consent_in_the_United_States#Texas

What are the consequences of having sexual relations with someone under the age of consent when they had convinced me otherwise

See https://en.wikipedia.org/wiki/Ages_of_consent_in_the_United_States#Oklahoma and...

Is it considered statutory rape if I'm 15 and my boyfriend is 18?

I agree with everything said by Attorney Ness. See https://en.wikipedia.org/wiki/Ages_of_consent_in_the_United_States#Mississippi. You and...

What is the legal consequence for a 18 year old and a minor dating?

Dating does not equal sexual relations. The first is not regulated by law, the second is. See...

Can anything be done legally about this type of behavior

Help her find better friends. Report the threat to beat her up to authorities.