If it helps anything, I'm 30 which is supposed to be peak cognitive ability. During some days / weeks I have that exact feeling. I think it's a mixture of cogni

If it helps anything, I'm 30 which is supposed to be peak cognitive ability. During some days / weeks I have that exact feeling. I think it's a mixture of cognitive bias (you probably don't remember all the "easy" things you struggled with 10 years ago) and that it's completely natural to have periodic ups and downs in your cognitive abilities. On some weeks I'm just not feeling it.