A blurry old photo is unfortunately, going to be just that. In Lightroom you have the detail panel that can apply some sharpening and you can work with the texture adjustment. Then you can go to Photoshop and on the filter menu there is a Shake reduction filter and other noise reduction filters. But if the image is blurry I don't know of any method to make it sharp. It is possible to improve the contrast, perhaps and make the image the best it can be. But there is only so much that can be done.