What do you plan on doing with the sail?
Eventually sails wear out. Some of us continue to use them till they Disintegrate in a strong breeze. Others chose to look at sails as we would a motor. When I gets tired we either scrap it or we sell it.
Usually old sails are not worth much. There are entrepenuaers who will grab just about anything and repurpose it. So is the case with sails. Google Old sails and you might find a repurpose person who will take your sail and give you a bag made out of sail cloth.
A new sail will make your boat look good and sail quicker. They are very rewarding, like putting a new outboard on a skiff. You'll buzz about the lake or harbor with new found speed.
It is up to you. You can also find sail tape. You can use it to put a patch over the area where the holes are. It will hold the sail together a little longer... You will be able to see the ghost of the old numbers you remove.
They may look a bit like this.. It is an acquired taste.
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