|Hi, first of all, good work! This piece really takes you through the rambling, ephemeral thoughts of an aging man. True to its title, it displays well a part of Caleb's life.
Some constructive criticism - I thought that this wasn't structured well for easy reading. In such a long paragraph it's easy to lose where you are, and the way it flits from thought to thought makes following the dense lettering harder than it should be. Of course, you are the writer, so feel free to disregard anything I say - it's your writing! You make of it what you want to make of it. Another thing is that maybe the sentence lengths could be varied more. This is a technical, nitpicking point, but I feel that it helps create a sense of rhythm in prose that isn't poetry, but is still nice for the reader. Of course, flowing thoughts don't represent dementia very well, so that's another point that could go both ways.
My final criticism isn't really a criticism, but more a request. Caleb clearly has a lot of backstory - you've built his character up excellently in a short space to achieve this - and I would prefer to see more of it. I would like to know his old style, magnificent thoughts, his syntheses, his reality molding. I would like to take the time to fully appreciate his full capacities, and his eventual decline. Does he create his epiphany? What guilts need absolving? My final criticism is that this piece is too brief, and I would really enjoy reading a fuller piece on this theme.
Criticisms aside (minor or not), this is well written, and from a grammatical point of view is flawless - this is always welcome. You have a good ability to describe character concisely, and you hint at backstory very well. All in all, this is a very good short story. Write on!