It doesn't seem to be, no. Especially if no sex is involved, and even if sex is involved, I can't imagine any issues arising, provided it is consensual.
Its not illegal to date, go out and the like but to engage in sex, yes, that is illegal...
No
No.
it isn't illegal to date, but it is illegal to have sexual intercourse.
No. He is a child and so is a nine year old. It is illegal for them to date.
no
it is illegal.
No
No
Its not illegal to date but you cannot have sex. It would be classed as rape on the 20year old boy.
Technically, it's legal to DATE anyone.
It is not illegal for anyone to date.