At what point does a book become historical?

[zeldas_lullaby]

I found an agent in my big book of agents who specializes in historical fiction, and yet he made it clear that he didn't want any historical fiction from before the 20th century. I thought that was a hoot, since most of history was before 1900. Also, many agents insist that kids today view the '90's as distant history. These agents don't want any YA that isn't now. (In other words, cell phones are in. Phone booths are out.) I agree with that a little bit--I picked up a new YA release a while back, and it featured the web site MySpace. I was thinking, "Wow, that's outdated."