I don't know you personally but I doubt cognitive decline has anything to do with this. As we age, we usually end up with more and more life responsibilities, beyond just the work we are doing. All of that is input to the brain and requires energy in response. The brain is not infinite. I often feel as you do, but then I have periods where I am as light and agile in my productivity as 20 years ago, maybe even more so…
I'll second this. Based on my own experience (I'm 50) it's all about energy levels. When my energy is high, I can code like I did two decades ago. Probably better. I guess the difference is that in your twenties, energy is almost for free. As you get older, you've got to be smarter about it - all the usual things - diet, exercise, avoiding stress... Not that I'm good about those things - I do OK but not great. Someti…
This is an amazing insight. I’m almost 46 and feel like I’m at the top of my game, programming-wise, but also, I’m probably at my healthiest. And that’s worked-for health, not the kind that comes for free in your 20s (generally). And I think about and pay attention to energy levels during the day, and just know when I’m toast for the day and time is better spent elsewhere. I take a brief afternoon nap before coffee most days. I pay attention to when my mind is receptive to new information. I let some things bubble away in my subconscious and sometimes make new insights on walks, in the shower, or while making coffee.