Hi Joe and welcome! Do you have a way to post a picture of the bow. Also if there are any numbers on the bow, and you can take a photo or describe them, that could be helpful. Often the weight is written or stamped on the bow somewere (but I've found a lot of lighter weight older bows are not marked). Is the bow solid wood, or is it laminated with fiberglass?
I have a number of "old" bows that I shoot regularly, ranging from bows made in the mid 1950's to the mid 1960's. The oldest one that I can date with any certainty was made in 1955, which puts it at 53 years old (older than me!). I have both Fred Bear and Ben Pearson bows of that age. I have had no problems with mine, but I do check them out carefully before using them.
Start by easing old bows back into service by stringing them up and leaving them strung for a few days before you pull on them. Then pull them to 18" or so and let down slowly-do this a few times. Do this in a quiet room and listen for any funny noises, pops, clicks or anything like that. Then I wait a day or two and pull them to full draw after I exercise them a bit to "warm them up". Again do this in a quiet room listening carefully for any unusual noises. If it passes this test I shoot it. If it doesn't pass, hang it on the wall or make it into firewood.
I have a lemonwood Ben Pearson longbow that is backed with Fortisan (I think). I am guessing it is from the mid 1950's. I shoot it, and last summer a Boy Scout used it to get his Archery Merit Badge. It hasn't broke. Now I don't recommend letting Boy Scouts use your old bow, and probably wouldn't do it again. They can be pretty hard on equipment. But just because it is old doesn't mean it is going to break the first time you shoot an arrow.
I'm with you. If I can't use it, I'm really not interested in having it. As for a string, there are a number of folks out there that can make one, and I believe one or more of TradGang sponsors could help you out. Do a search for "strings" on the Pow Wow. If you decide to continue your collection of old bows, learn how to make your own strings! It is fun, not really too hard, and will save you time and money.
RonP