Yoda's brain
Yoda's species is long-lived. The guy lived to 900, and while some of that may ne attributed to Force mastery, I'm going to go out on a limb and say at least half of it was biological. That being said, Yoda at 800, seemed to be having spot on cognitive functioning (no senility or forgetfulness). However, his brain must have a different perception of time, then the rest of his shorter lived peers. At 800, can Yoda remember stuff that happened when he was 500? Is his brain structured so he can, or is the last 300 years a muddled blur to him?