If you are afraid of losing your driver's license and they don't accept your expired ID, why don't you say "ok, I show you my current fake ID!" After all, lots of teenagers have them. Seriously, you can't say that.

Consider hanging your valid ID around your neck when you get close to the airport and only put in back in your wallet after boarding the plane.

"I drive, therefore I am"

Here's the link to FAA's consumer info page: http://cas.faa.gov/faq.html , hopefully it'll provide some information.