Some are only taking up to 3 months expired, but that doesn't mean to NOT send them.
DO NOT send the coupons for what is made locally in your area. You would not believe how many coupons are sent for XYZ Toilet Paper and come to find out, it's just a local item.
All coupons are graciously accepted by those that use them. I used to be the Point Person for collecting coupons for the command in Hawaii. Had TONS of ladies send envelopes full of coupons and we would have a potluck once a month with a free for all with the coupons.