For this sort of thing, I pretty much would expect a cassette version.
Believe it or not, it's not just the 65+ age group that has cassette players.. quite a lot of middle aged peeps still got em too and it's not odd at all to see a cassette release for folk/traditional releases. Most of my friends' parents or my own (older) family members still use em too.. also for children. No, they're not still walkin around with a boombox rofl- they also have the standard CD players, etc but the cassette is still chugin along for different purposes.
Vinyl records are still VERY popular but it's almost a totally different demographic.
To try to make more sense out of it instead of my verbal diarrhea, just as an example.. I still use vinyls, cassettes, cds AND of course, my iPod. But it's like.. I could never listen to let's say, Morning Musume on vinyl (even though I own it) because it feels utterly misplaced. Yet at the same time, I could also never listen to Ramsey Lewis or Mieko Hirota (60s singer) on CD for the exact same reason. I personally know a lot of older folks also apply this same sensibility. My grandparents were a perfect example of this before they died. They had a CD player like everyone else.. plus the standard cassette player and record player. Again, they would almost exclusively listen to different things on each respective player. If there was a release for like, traditional music on cassette, they'd grab the cassette. They'd even go as far to buy like a cheap cassette bootleg version if they could or even had me buy a CD and record it onto cassette for them. This isn't something rare at all. ><