The following definitions are from Wiktionary, searched as of today.
Dementia, noun, (pathology) a progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected rom normal aging. Areas particularly affected include memory, attention, judgement, language and problem solving.
Alzheimer's disease, noun, (neurology, pathology) a disorder involving loss of mental functions resulting from brain tissue changes.
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Many years ago, I took the time and effort to learn how to solve the Rubik's Cube.
Granted, I learned only the beginner's method, so it's not for speed, but just for being able to solve it.
I put in the time and effort, and for a few years after that, the skill stayed with me, so I thought it's something that will stay for life, like how to ride a bicycle. Learned once, skill gained forever.
But I was wrong, for I have lost the skill. Retained neither the muscle memory nor the brain memory.
Sad, for the lost in memory, the skill, and the effort.
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