Nope, I don’t get asparagus pee. I do, however, have the cilantro-tastes-like-soap gene.
I did some research and it appears that everyone gets smelly pee but the difference is only some people can smell it. So while you may not smell the asparagus pee, other people will 
This.
The descendants of the people who lived in Germany 40k years ago are likely spread across the world by now, and the people living in Germany now are probably 1/6 Roman, 1/6 Celt, 1/6 Slav, 1/6 Some-Forgotten-Civilization, etc.
That guy that checks your ticket at the Boston Amtrak station might be a descendant of a Roman general. Or maybe a Viking.