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.
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Age:
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The age of a person can be counted differently in different cultures. This calculator is based on the most common age system. In this system, 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 one baby is born just one day before the Traditional Chinese New Year, 2 days later, the baby will be 2 even though he/she is 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.
FAQ
How is age calculated here?
By the most common age system: age increases on a person's birthday. The calculator counts complete years and months between the two dates by comparing the day of the month, then counts the remaining days, and also converts the whole interval into weeks, days, hours, minutes, and seconds.
Why can the months and days look odd at the end of a month?
Months have uneven lengths. From Feb. 28 to Mar. 31 this calculator counts one month (to Mar. 28) plus 3 days — the former of the two common conventions. The same situation arises for pairs like Apr. 30 to May 31.
Can I calculate an age at a past or future date?
Yes. The second date can be any date on or after the date of birth — use it to find how old someone was on a past date, or how old they will be on a future one.