In the US it's legal for anybody to DATE anybody. However, if you're using "date" as a euphemism for "have sex with" ... then in some places in the US it would be illegal, but in Texas specifically it's (probably) fine; the age of consent in Texas is 17.
This assumes there isn't something else going on which is itself illegal (for example, if the 17 year old is a high school student and the 20 year old is a teacher at that high school; in that case it's not the ages that make it illegal, it's the educator/student relationship that makes it illegal).
If you know a girl in Texas that is 17 years old and she is with a 19 year old guy is it illegal
yes it is, the legal age in Texas is 17 :)
yes it is legal
no
To date - yes. To have sexual relations with? That's a whole other question.
Get outta here you Pedo!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Only dating isn't illegal anywhere.
Yes, she is the age of consent and of legal age. You are both adults.
Why not? Everything's bigger in Texas. Think about it.
yes
They are both minors, so yes.
They are both minors, so yes.
I live in Texas and it's illegal here. But it depend on which state you live in.