What is your method for writing yourself a reminder for many years in the future? Like, "Replace the smoke alarms", or "Renew your passport", or "Get a Tdap booster shot in 10 years AND TAKE IMODIUM" (which is something we just learned, bleh).
I don't want to rely on a calendar app, because I doubt we'll be using anything compatible 10 years from now. Our current techniques are The Little Pile Of 5x7" Paper Notes (me) and The Eternal Spreadsheet Of Chores (my wife).
Any other techniques you've tried?