What is defined as a group of people with shared value systems based on common life experiences?

The correct choice identifies a subculture as a group of people who share unique values and beliefs that differentiate them from the larger culture in which they exist. Subcultures often emerge based on common experiences, interests, or lifestyles, and they foster a sense of community among their members.

Members of a subculture typically engage in behaviors, practices, and traditions that reflect their shared values, which can be influenced by factors such as ethnicity, religion, or shared hobbies. This distinct identity allows subcultures to express themselves in unique ways while still remaining part of the broader cultural framework.

The other options, while related, do not encapsulate this specific definition as effectively. Demographic groups are more oriented around observable characteristics such as age, gender, or income. Social classes are classifications based on economic status and lifestyle choices rather than shared life experiences or values. Cultural groups are broader and encompass the entirety of a culture, which may include multiple subcultures. Therefore, "subculture" is the best fit for a group united by shared values stemming from common life experiences.