An age calculator is a tool that helps determine a person's age based on their birth date. By inputting the birth date and the current date, the calculator can quickly provide the exact age in years, months, and days. This can be useful for various purposes, such as planning birthdays or understanding age-related milestones. Many age calculators are available online, and some are even built into smartphones and apps. They can also calculate age differences between two people, which is helpful for understanding relationships or planning events. Overall, age calculators simplify the process of determining age-related information.