Well, it probably won't set any age records, but Cedar Point amusement park does have a collection of EM's in service. Cedar Point also has a "museum" inside the park that has some coin accepting early 1900's games that still accept coins and work. Two hand crank horse race games and an old "football" soccer game of about the same vintage. I want to say they are from the 1910's.

came across a GtB Big Brave at a local arcade 25 cents gave 2 plays
someone bought it up though

Arcade Amusements in Manitou Springs, CO has some really old stuff. Arcade games from the 20's. Not sure what the oldest pin they have is now. Here are some pics and videos, couldn't find a complete game list.

http://forums.arcade-museum.com/showthread.php?t=98350

http://www.pinballrebel.com/locator/searchform.php?pinname=&busname=&city=Manitou+Springs&metroarea=Any&state=CO&country=

Go to the 7:30 mark for the "Penny Arcade" part

Marvin's says it's a museum, but you can play all the stuff:

PPM or Musee Mecanique may have the oldest, although I think the really old stuff at PPM has the coin mechs removed. MM has lots of old coin op stuff. Probably the best all around collection of old coin op stuff still on location. Everyone should go there at least once.

MM was on an episode of Storage Wars recently. The old dude took some old toy boxers there to have them appraised. The keeper of MM, Dan Zelinski, wheeled up on his tennis shoes/roller blades with a badge on his shirt that said I WORK HERE. Cool dude.

here in my local area at Pinball n Pizza in Aus there is a Playboy and a Mata Hari