Similar experience here: I setup Debian stable for my 76 yo mother, and for a 79 yo friend. Works like a charm, and the 2 years release schedule is perfect for people who don’t care about bleeding edge and would rather have stability.

Unattended security upgrades keep it secure, and in my experience a bit of initial “locking things down and simplifying” is valuable, but after this it’s smooth sailing compared to other older folks I help with Windows systems where MS is constantly throwing at them insane bugs, complete UX changes, ads, or Copilot everywhere.