There is no single, definitive answer to the question of when humans first learned to count. However, there is evidence that suggests that early humans began to develop a sense of number and quantity as early as the Middle Stone Age, around 100,000 years ago. This evidence includes the discovery of tally sticks and other objects that appear to have been used for counting, as well as evidence of intentional burial practices that suggest that early humans had some understanding of the concept of one and two.

Over time, humans developed more sophisticated counting systems. The ancient Babylonians, for example, developed a base-60 system of counting that was used for mathematical and astronomical calculations. The ancient Egyptians developed a decimal system of counting that was based on the ten fingers. And the ancient Greeks and Romans developed a system of counting that was based on the abacus.

As civilization advanced, the need for more sophisticated counting systems grew. The development of the written word, for example, required the development of systems for representing numbers in a written form. And the rise of trade and commerce required the development of systems for measuring and quantifying goods.

The modern system of counting, which is based on the Arabic numerals 0-9, is thought to have originated in India in the 7th century AD. This system was eventually adopted by the Arabs and then spread to Europe. Today, the Arabic numeral system is the most widely used counting system in the world.

So, while the exact date of when humans first learned to count is not known, there is evidence that suggests that early humans began to develop a sense of number and quantity as early as the Middle Stone Age. And over time, humans developed more sophisticated counting systems that eventually led to the modern system of counting that we use today.