سن (سن) is a unit of measurement used to describe age, particularly in the context of human life. It indicates how many years a person has lived since birth. For example, if someone is 25 سن, it means they have been alive for 25 years. Age can influence various aspects of life, including health, education, and social roles. In many cultures, سن is also significant for determining eligibility for certain activities, such as voting or drinking alcohol. Different countries may have different legal سن for these activities, reflecting cultural values and norms. Understanding سن helps in recognizing the stages of life and societal expectations.