I'm in my 70s and retired. My todo (TickTick) is vital. Every day is full of surprises: "Hey, today I need to do my daily stuff!". Or (earlier today) "Who knew it was Friday!".

No, I just use my notes app.

I use a text file. But I use my own format.

#todo, p1{ Get vaccinated. }

https://github.com/PratikDeoghare/brashtag