I’m another who’s kept a diary in different forms since 1972! 5 year ones full of teenage angst, then annual appointments diary to keep on top of ante natal, clinics, jabs & school terms for DD etc.
Then purely for my own admin I’ve moved onto a daily note of all that I need to sort…from household drudgery (fiscal, culinary or hygiene) to social delights with family and/or friends.
This started on paper before smartphone before I realised the act of actually writing embedded the importance in my brain…so I’m back to a Filofax (otherwise known as the bible) which, as a good Gideon, lives on my bedside table and is never far from my person!