An age group refers to a specific range of ages within a population. It is typically used when discussing or analyzing data related to people in different stages of their lives, such as demographic information, health trends, and consumer behavior patterns. Age groups can vary depending on the purpose for which they are being defined, but common categories include children (0-12 years), teenagers (13-17 years), young adults (18-34 years), middle age (35-54 years), older age (55+ years) and seniors (65+ years). Age groups are important for understanding the needs, behaviors, and characteristics of different generations within a society.