What are the differences between life in the Old Stone Age and life today (21st century)?

In the Old Stone Age, people lived nomadic lifestyles, relied on hunting and gathering for food, and used simple tools made of stone. In the 21st century, people live in settled communities, have advanced technology for communication and transportation, and engage in diverse occupations beyond just hunting and gathering. Additionally, there have been significant developments in areas like healthcare, education, and overall quality of life.