The age of the LP's is not a problem. I have hundreds that old or older that are in fine shape.
Your description of their care and condition is not encouraging however. As Calbrs03 said, scratches are non-reversible.
So are other types of less visible damage. LP's played on inexpensive or poorly set up rigs tend to be damaged by the mere act of playing, even if carefully handled. None of the LP's I had as a teenager is listenable now, even though I handled them more carefully than most of my friends. My "kid's" rig was destroying them, though it took better rigs and systems to reveal it. By then it was too late.
Clean a few that interest you and play them to see how it goes before spending alot of time, effort or money on cleaning the whole lot.
Your description of their care and condition is not encouraging however. As Calbrs03 said, scratches are non-reversible.
So are other types of less visible damage. LP's played on inexpensive or poorly set up rigs tend to be damaged by the mere act of playing, even if carefully handled. None of the LP's I had as a teenager is listenable now, even though I handled them more carefully than most of my friends. My "kid's" rig was destroying them, though it took better rigs and systems to reveal it. By then it was too late.
Clean a few that interest you and play them to see how it goes before spending alot of time, effort or money on cleaning the whole lot.