16? No way. far too many down-side possibilities. No, non, net, nee.
The only way I’d consider hiring a young au pair is as a mother’s helper, which I did for many summers (mine came from other parts of the US not from abroad). It was great and the girls became members of our family. I still keep in touch with many of them. However, it was still a big adjustment for them being away from their families, culturally, learning to get around etc… I had a few that didn’t work too. The family - au pair relationship is key…matching personality and expectations.