What is the oldest (optional) element of your daily routine?
So not bathroom related tasks, but more like some arbitrary thing you must and always do daily.
For me, I watch Anton Petrov's daily white paper summary with dinner since some time in 2018. Even when New Pipe is down, I hit up Vimeo or Odyssey to watch Anton.
Making coffee and tea for my wife when she wakes up, make the lunchbox for my student son, sometimes also for my wife if she needs to get to the office. Nobody eats breakfast so after that I clean up and fill the dishwasher from last nights dinner, that I cook daily. Inbetween I game, relax, make music, pet the cat.
It is nice being early retired and doing the housekeeping.