<human>:  When did the Age of Bronze start and when did it end?
<bot>: The Bronze Age started around 4,000 BC and lasted until around 2,000 BC. The Bronze Age was a period of rapid development in human civilization, which saw the invention of writing, the wheel, and the first cities. The Bronze Age was characterized by the use of bronze, which was a much stronger metal than copper and allowed for the construction of more complex tools and weapons.