I turned 40 this part March and for a while I felt the same way. "Oh gosh, I'm losing my neural plasticity at a rapid pace!" Nope! I was just having a mini cris

I turned 40 this part March and for a while I felt the same way. "Oh gosh, I'm losing my neural plasticity at a rapid pace!" Nope! I was just having a mini crisis of self-perception based on an arbitrary number and once I got used to being 40 my mental acuity magically returned to me. I suspect the same will happen to you.