As the other answers point out, it may technically be legal for a 23 year-old to have sex with a 17 year-old, because the age of consent in Washington is 16.

Is a 17 year old dating a 23 year old illegal?

A: Its legal for anyone to date anyone else. The law is not concerned with dating, but is concerned with sex. It is technically legal for a 22 year old to have a sexual relationship with a 17 year old; however, it still not a good idea. First, a 17 year old is still a minor.

Can a 17 year old date a 24 year old in Washington?

Washington does not have a Romeo and Juliet law, so it is still unlawful for someone under the age of 16 to engage in sexual activity with someone slightly older. The younger person is younger than 12, they may lawfully engage in sexual activity with their spouse, as long as the spouse is less than 24 months older.