What are some characteristics on agricultural age?

If you referring to the agricultural revolution, then some characterisitics would be a sharp increase in population, people settling down instead of mass migrations, and the expansion of settlements into towns.

If you are referring to the time when most of the world's economy was centered on agriculture, then this would be a bit more broad. Some characteristics would be the creation of peasants and serfs, who usually did hard labor for little or no pay. Another characteristic would be the poverty, as production of food brought in next to no money, and instead mainly fed the farmers who grew the agriculture in the first place.