I have LPs pressed in the early 1950s that play just fine too. One example (Benny Goodman) is 65 years old and still plays fine.
The Library of Congress did an archival study in the mid 1980s that suggested that laminated media like CDs would last decades while amorphous media like LPs and LP stampers would last centuries (all heavily dependent on quality of storage of course). I think I would be bored to death of the cut by then though.