I found this report from NIST that estimates tape to last 20 years, CD-R and DVD-R 30 years, and M-DISC 100 years ๐คท (I didn't even know optical was used professionally, and found the term "optical jukebox" to be hilarious :)
https://www.nist.gov/publications/digital-evidence-preservation-considerations-evidence-handlers
But more importantly, an actively maintained storage system will last forever (as long as maintained). And for example AWS S3 Glacier Deep Archive costs just $0.00099 / GB / month*, so you can store terabytes for the price of a cup of coffee.
*Plus extra fees for access and stuff, but the point is managed storage isn't particularly expensive unless you have very large amounts of data or heavy usage.
"Detergent sheets", "dryer sheets", it's like you're in a different world with these fantastically strange single-use products :D
They look like a tissue made of rough fiber, do they dissolve or do you have to throw them away after usage? Either way it seems less practical than just adding a bit of powder, but what do I know :)
Another replacement for fabric softener is hair conditioner (diluted with water so it runs better). I only use it when washing polyester fleece, since that gets fiercely static, so it's nice to be able to use a product we already have at home.