As long as you are aware of the risks, the best judge is you. There arent any laws around being in a non-sexual relationship where one person is under 18 and the other over. Once you turn 16 its not illegal for someone to have sex with you no matter how old they are.

Can a 16 year old be with a 40 year old?

This means that its against the law for someone to have sex with someone under the age of 16. It wouldnt be illegal for someone whos 16 to have a relationship with someone who is 30 - unless that person is their teacher or in a position of authority. - feel equal, safe and trust one another.

Can a 16 year old date a 42 year old?

It is legal as long as they are not in a student- teacher relationship and he is not in a position of authority.