I wanted to know if there is any birth date information on the Gundam Wing characters?

I only could find Relena Darlien.

Here's a few more:

BIOGRAPHY Shigeru Nakahara
Recent Role:
Android 17 (Japanese) on Dragonball Z Birthday:
1-22-1961 Birthplace:
Kanagawa, Japan (hometown) Birth Name: AKA: Nakahara Shigeru Shigeru Nakahara is a voice actor in Japan. Some of his prominent roles include Android 17 in Dragonball Z, Fujiwara-no-Takamichi in Haruka: Beyond the Stream of Time, and Trowa Barton in Mobile Suit Gundam Wing.

Kirby Morrow
Role: Trowa Barton
Kirby Morrow (born August 28, 1973 in Jasper, Alberta) is an accomplished voice actor, stand-up comedian, and television and stage actor. He currently resides in Vancouver, British Columbia. He has... Read More »

Ai Orikasa
Role: Quatre Rebera Winner (Japanese)
Born on December 12, 1963 and nicknamed Orion, Ai Orikasa is a Veteran Japanese seiyuu (voice actress) known mostly for playing over 140 various roles in anime. Some of her most noted roles include...

You can find more cast members here:
Gundam Wing Cast and Crew - TV.com

If you click "READ MORE" at the link, it gives the birth dates.

That is not exactally what I wanted.