An age calculator is a tool that helps you determine your age in years, months, and days from a specific date. Most age calculators ask for your date of birth and the current date, which it then uses to calculate your exact age. Some age calculators also allow you to calculate your age from a past or future date, which can be useful for planning events or determining eligibility for certain programs or benefits. Age calculators are commonly used on websites or mobile applications related to retirement planning, insurance, or healthcare.