Welcome to LTG!
Your Guild Starfire 5 was made in Westerly, RI. and most probably in year 1999. As my reference, S/N CH002304 for instance was made in year 1999. Your CH0022xx is close to that. Hans Moust is the only person who can confirm the exact year of manufacture, but he needs the full S/N I guess. Let's see if he reads this to confirm it for you.
Ralf