There's this thought that keeps popping up in my head more frequently recently.

We are people who do heavy mind work. Our quality of life directly depends on our ability to come up with solutions. We've been training our minds for years, for decades, to get to the point where we are now.

Now stop for a moment. And imagine. You wake up one morning and you realize you can no longer code. You forgot all of it. You still can copy-paste answers from SO, but you don't know what questions to ask to get to those answers.... Your mind has pulled the DROP TABLE PROGRAMMING;COMMIT; stunt. From hero to zero in just 1 night.

You have no clue what happened, no idea whether you will recover. How does that affect your identity? Would you still try to climb the programmers' tree to the sweet spot you are in now? Would you choose some simpler profession instead, considering your age and time required to master that other profession? If you choose another profession - what would it be?
What would you do with your personal projects? You can't continue them yourself obviously... Would you let them die with the loss of your skills?

How closely is your profession related to your identity?

Now that I consider myself a person who's quite good in the field, this is becoming one of my fears. Sadly, it'll most likely come true someday. Either some accident or just old age, or even diseases/conditions at younger ages - there are so many things that could mess up your mind - the sole tool critical for our profession [to the picky ones: lumbers can't swing axes w/o hands, postman can't deliver mail w/o legs, politics can't lie without tongues, and we, engineers, cannot build with our minds even slightly off].