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Dating is not the issue. Sexual activity is.
There are no laws about dating. And the age of consent to sexual activity is 16 in Washington state.
No, generally dating, any sort of romantic social interaction, is not an appropriate activity for children.
No, There has been no activity between them. Selena Gomez is currently dating Justin bieber and they are going strong.
It can lead to peer pressure that can lead to sexual activity.