Age Calculator

Date of Birth:

Age at the Date of:

How Age is Calculated:

This calculator uses the most common age system, where age increases on a person's birthday. For example, if someone has lived for 3 years and 11 months, their age is 3, and it will increase to 4 on their next birthday.

In some cultures, age is counted differently. For example, in traditional Chinese age systems, people are born at age 1, and their age increases at the Traditional Chinese New Year.

For month-end dates (e.g., Feb 28 to Mar 31), we count Feb 28 to Mar 28 as one month and add the remaining days.