An age calculator is a tool used to determine a person's age based on their date of birth. It can be used to calculate someone's age in years, months, weeks, days, hours, minutes, and even seconds. Age calculators are widely available online and can also be found as features on some mobile phones and computers. They are especially useful for determining important milestones such as legal voting age or retirement age. Age calculators are simple to use and can provide accurate results quickly..