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Want to feel old? Pearl Jam is celebrating its 20th anniversary.

The Seattle grunge band that along with Nirvana came to define '90s rock is celebrating a big birthday -- and they're marking the milestone with a double-disc set of archival recordings, an art book/written history and a new documentary/soundtrack, The Los Angeles Times reports.

The documentary, "Pearl Jam Twenty," which premiered at the Toronto International Film Festival over the weekend, is a history of the group directed by Cameron Crowe (who also happened to direct one of the ultimate '90s movies, "Singles").

SODAHEAD SLIDESHOW: See the best American rock bands of the 1990s. 

But amid all of this looking back, the band is still going strong in the present, too. They played a sold-out show Monday night at Toronto's 20,000-seat Air Canada Centre -- even though frontman Eddie Vedder is now 46 years old.

"We're in a kind of golden-years period. We have families now, and we're just really happy to be playing live," Vedder told the L.A. Times.

So even though it's been 20 years since we hoofed it over to our local record store to buy "Ten," Pearl Jam still rocks.

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Which got us thinking ... from Pearl Jam to Nirvana to the Red Hot Chili Peppers, let us know: What was the best American rock band to come out of the 1990s?