1. The plastic age. We don't make our tools out of stone anymore, everything's plastic.
2. The meat age. The barbaric and heartless time in human history when people were breeding an insanely amount of animals in the most obscure ways to get tons of tons of meat. (Thinking like this, I really wish I'd take the full step to become a vegetarian)
3. The materialistic age. That time when people tried to become happy by buying things (other than the necessary). People still feel empty even though they have five sports cars in their garage and 10 LV bags in their wardrobe. Shopping can give you a moment of happiness but it doesn't last for long. Soon you will crave something else. I have such ambivalent feelings towards shopping/money/materialism, but I believe that long-lasting happiness only can be acquired by a change in our mindset.