I am already done with my masters but I want to go back to school for another one. The only thing is that I got my masters 9 years ago. I know GRE is only valid for 5 years. Since I already done with one masters, would I be required to take the GRE again if I want to go for another one?
I applied to a top department at an RU/VH university in the United States, and asked to have the GRE requirement waived for exactly the same reason, and they waived the requirement, and then admitted me to the program.
Ask the admissions office/committee if they will wave the requirement.
Short answer, yes. If you want to apply for another masters degree you have to submit a full application (with in-date GRE scores). If you have maintained a close relationship with the university, you may be able to wiggle out of the GRE requirement, but that is because the faculty already know your work.
It won't hurt to ask. You should contact the admissions office and explain your circumstance. If the university is local, it might be worth showing up in person. Be polite, and be ready to have to re-study and re-take the GRE though.