Age Calculator
The Age Calculator can determine the age or interval between two dates. The calculated age will be displayed in years, months, weeks, days, hours, minutes, and seconds.
Result:
Cultural Notes:
The age of a person can be counted differently in different cultures. This calculator is based on the most common age system, where age increases on a person’s birthday. For example, the age of a person who has lived for 3 years and 11 months is 3, and their age will increase to 4 on their next birthday one month later. Most Western countries use this age system.
In some cultures, age is expressed by counting years with or without including the current year. For example, a person who is twenty years old is the same age as another person who is in their twenty-first year of life. In one of the traditional Chinese age systems, people are born at age 1, and their age increases at the Traditional Chinese New Year rather than their birthday. For example, if a baby is born just one day before the Traditional Chinese New Year, 2 days later, the baby will be 2 even though they are only 2 days old.
In some situations, the months and day result of this age calculator may be confusing, especially when the starting date is the end of a month. For example, we count Feb. 20 to Mar. 20 to be one month. However, there are two ways to calculate the age from Feb. 28, 2022, to Mar. 31, 2022. If we consider Feb. 28 to Mar. 28 to be one month, then the result is one month and 3 days. If we consider both Feb. 28 and Mar. 31 as the end of the month, then the result is one month. Both calculation results are reasonable. Similar situations exist for dates like Apr. 30 to May 31, May 30 to June 30, etc. The confusion comes from the uneven number of days in different months. In our calculations, we use the former method.
The way a person’s age is calculated can vary across different cultures. This calculator uses the most common age system, where age increases on a person’s birthday. For example, someone who has lived for 3 years and 11 months is considered 3 years old, and their age will increase to 4 on their next birthday, which is one month later. This system is widely used in most Western countries.
In other cultures, age is calculated differently. Some cultures count years with or without including the current year. For instance, a person who is twenty years old might be considered the same age as someone in their twenty-first year of life. In traditional Chinese age systems, for example, a person is born at age 1, and their age increases at the Traditional Chinese New Year rather than on their birthday. This means that if a baby is born just one day before the Traditional Chinese New Year, they will be considered 2 years old just two days later, even though they have only been alive for two days.
There are also situations where calculating age in months and days can be confusing, particularly when the starting date is near the end of a month. For example, counting from February 20 to March 20 is straightforward and equals one month. However, calculating the age from February 28, 2022, to March 31, 2022, can be done in two ways:
- If February 28 to March 28 is considered one month, the result is one month and 3 days.
- If both February 28 and March 31 are treated as the end of their respective months, the result is simply one month.
Both methods are reasonable, and similar situations arise with dates like April 30 to May 31 or May 30 to June 30. This confusion stems from the uneven number of days in different months. In this calculator, we use the first method for consistency.
