I am looking at buying a new mail sail
I have a goodall sail that is 1997 or 16 years old which seems to be ok or I am still getting good results with it
I am a bit bias towards goodall but this is all I have ever had just asking for any views or add vice thanks
Actualy I have this season replaced a fast sail, with an even faster sail. I was surprised at just how much the old sail which was still fast had stretched, the new sail was faster particularly as the leech stood up better. Also in your case sails have changed a little in cut in the last 16 years, so you will see some improvment there. But don't think that you can use a new sail the same as your old, it will take some time to get the hang of how to adjust it and get the same and then better speed than the old sail.
Brands to look at, I and most of the current fleet use Irwin sails. Also Aleygater are worth a look, as one of their sailmakers sails a Mossie so knows the class and I have heard some of the Legends of the class are working on developing sails with Aleygater. And as mentioned Goodall.