I've been in this position many times. We always bought a ticket. To me, it felt like the right thing to do - and there was NO WAY my kids would lie about their age if asked anyway. I certainly would have ended up embarrassed.
Laurie in OH, mom to
Alex, 11 years old
Julianne and Leah, 10 years old
Audrey, 2 years old
WDW visits in 1973, 1986, 1987, 1999, 2000, 2001, 2002, 2004, 2005!
Currently planning a December 9-16, 2006 trip!