Which "turn of the century" am I referring to?

I was talking with some people today, and the phrase “at the turn of the century” came up. We were talking about the late 1800s/early 1900s.
But now that we are in a new century (yeah, I know, nine years later), can this phrase still be used? When I hear it, I immediately think of the 1900s “turn of the century”.

What does the collective think?