So my wife has a 10 year old low end notbook. 500Gb of storage (HDD), 2GB of GDR3 RAM, and an intel Celeron Processor N2806. It originally came with Win 8, then she "upgraded" to win 10 and after that it was pretty much unusable. I am talking CPU and Ram about 80-90% in idle, opening a browser got everything down to a crawl. She mostly used it a storage and brwosing, watching youtube and occasionally to write. So I (also a Linux newbie) finally got the time to install a newbie friendly Os (Fedora) and it's so much better! I am Talking 20%CPU usage and 50%(?) RAM in idle.
You can sqeeze plenty of use from these laptops, especially the really light ones.
My gf works as an arts teacher in a primary school and needed something very small and light that she could carry every day to school.
The usage is mostly very light browsing (the school system, some Pinterest), showing the kids some reference images and the ocasional document editing and printing.
For a piece if what essentially is e-waste it handles that admirably, and because of the atom processor it sips power, which still gives it a few hours of battery life after about 10 yeas of ownership.
Tldr: Don't underestimate how useful an old laptop running a minimal linux disto can be for a casual user.