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.
Goes over all the hills and hollows, Bites hard, but never swallows.
Squeeze me and I cry tears as red as flesh, but my heart is made of stone. What am I?
You are my brother, but I am not your brother. Who am I?
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.