Shouldn't have degraded muich.....
....if the sails have been stored out of the sun and haven't gotten moldy. As to sail shape, that probably is about the same as it was when they were put away. And what do you have to lose by trying them? My old jib failed by tearing a rather large gap along the leech. We were about 10 miles from port at the time but it still got us home. A little noisy, but it made it.