Physical media doesn't have an unlimited shelf life due to decay of the physical media. Do your cassettes still work?
When I was a kid in the I bought a box of old cassette albums at a garage sale. Most of them were made in the 1960s, including gems such as "In-A-Gadda Da-Vida" and Wilson Pickett's cover of "Hey Jude". They still work just fine, and I ripped them to mp3s a couple of years ago.
(Those cassettes do feel much heavier than modern ones, and IIRC, they say "Made in Elk Grove Village, IL by Ampex". I suspect that they were quite a bit pricier than the vinyl versions when they were new.)
I've also ripped all my vinyl records, some made in the 1950s, and hundreds of CDs, many going back to the 1980s, without any significant errors. The only format that's had a lot of problems were my handful of 8-track tapes, about half of which had the loop break at the splice or the foam pressure pad disintegrate.