Reverse Age Calculator
If you know a person's age either on a specific date or in a given year, and want to know approximately when that person was born, use the Reverse Age Calculator, which re-winds the clock from that date to determine likely birth date range.
If you know exact age on a given date, the Reverse Birthdate Calculator can determine exact birthday.
Entry Fields
In the Age field, enter the age of the person for whom you are calculating. Use the next field to indicate when the person was this age.
In the Age on Date field, enter the date on which the person was the age you specified. If you know the exact date, enter the month, day and year. If you only know the year when this person was that age, specify just the year. If month and day are left blank, the calculator will default these to June 30th, midpoint in the year.
Optionally, enter the name of the person for whom you are calculating.
About Calculator
There are many situations where a person's age on a specific date (or just year) are referenced, and we want to then know approximately when that person was born.
The reverse age calculator determines the person's approximate birth year range. If you specify the full date corresponding to the person's age, the results will indicate the likely date range within which the person was born.
If you know a person's age on a specific date, our Reverse Birth Date Calculator can calculate the person's date of birth. This is helpful, for example, when a gravestone only lists date of death and age, as well as in other historical contexts where event dates and ages are available.