I am in my seventies, was an orphaned German immigrant brought to the US when I was six years old. I honestly can say I have absolutely no idea if I have ever come across a person that is Jewish. Been in 4 countries, 8 US States and you would think I would have had some type of dealing some time, some where, But nope I haven't. They must be a group of very normal people to meld in so well.
I actually had a Jewish employee many years ago.
The only way I knew he was Jewish was about 6 or 7 months after I hired him he came to ask for a day off for some Jewish holy day that I had never heard of.
I asked him if he was just blowing smoke up my ass for a day off, he showed me that it was a legitimate Jewish Holy day so I told him fine.
Never would have known he was Jewish otherwise.