Minecraft wiki entry for Entity_format, associated text: : The entity's root tag.
 Health: The health of the item, which starts at 5. Items take damage from fire, lava, and explosions. The item is destroyed when its health reaches 0.[needs testing]
 Age: The number of ticks the item has been "untouched". After 6000 ticks (5 minutes) the item is destroyed.
 Item: The item of this stack.
Tags common to item stack[show]
 OwnerID: If present, only the player[needs testing] with this Unique ID can pick up the item.