...you hate to throw old tea away...don't you. I know I do. Keep it for years...and years...especially if it is in a cool tin. I have more than my share of RoT in tins that I am still in denial about.
Realistically, green tea fannings, which are generally used for bags, last for a shorter period of time than black fannings. I would say, bite the bullet, and move past the denial stage to grieving, then acceptance stages...those bags have probably lost their edge.
They might be ok for flavored iced tea...if you have flavorings. If you are trying to get back into greens, get some good fresh loose from your fav supplier.
Just my opinion...hypocritical though it may be...