Answer:
Six letters do my name compound; among the aged oft I'm found; The shepherd also by the brook hears me when Leaning on his crook; but in the middle me divide and take the half on either side each backward read a liquor tell ev'ry gay toper knows it well.
I come with a train and go with a train and the train doesn't need me but can't go without me.
I am partially baked. I am not completely lit. I am a portion of the moon. I am lesser than full wit. I am a divider of the hour. I am not a total lie. I am a sibling through one parent.
What always ends everything?
Cold head and feet; round as a ball; always turning around myself.
What did the piece of wood say when he saw the screwdriver and screws approaching?