Everyone I know seems to think their 'memory is going'. It's a thing people say. Even people in their 20s. But as I'm now in the second half of my 50s it's probably more likely to be true for me.
And I'm conscious that I use alarms and to-dos a lot more than I used to. It's not just about the cognitive off-loading of Getting Things Done. It's setting a task at the top of the stairs so I remember it when I get to the bottom. And I have a slight consciousness that this is a habit that will stand me in good stead when as my prospective memory does start to fade.
It also occurs to me that I'll probably never change some of my digital tools. I use Simplenote for simple notes and Things for things I need to do. I spent many years prospecting for exactly the right one but now I've developed muscle memory for these tools it feels like I should stick with them. I suppose the next quirk will be resisting updates.