Bill,
If you have a program such as Adobe Photshop, one with all the editing facilities, scan your aged sheet music into that program. Then you can adjust the brightness, contrast, etc., until you get a great looking graphic page, then save it in the appropriate format. You'll see a big improvement in the results.
Good Luck,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)