Often you may want to calculate the average age in Excel based on a list of birth dates.
For example, suppose you would like to know the average age of people in the following dataset:
The following step-by-step example shows how to calculate the average age.
Step 1: Enter the Data
First, let’s enter the date of births for 10 individuals:
Step 2: Convert Date of Birth to Age
Next, we can type the following formula into cell C2 to calculate the age of the first individual:
=YEARFRAC(B2,NOW())
We can then click and drag this formula down to each remaining cell in column C:
Step 3: Calculate Average Age
Next we can type the following formula into cell E2 to calculate the average age of all individuals in this list:
=AVERAGE(C2:C11)
The following screenshot shows how to use this formula in practice:
We can see that the average age of these individuals is 46.265 years old.
If you would instead like to display the average age in terms of years and months, you can type the following formula into cell F2:
=INT(E2) & " years, " & INT((E2-INT(E2))*12) & " months"
The following screenshot shows how to use this formula in practice:
We can see that the average age of these individuals is 46 years and 3 months old.
Additional Resources
The following tutorials explain how to perform other common tasks in Excel:
How to Calculate the Number of Months Between Dates in Excel
How to Convert Date to Month and Year Format in Excel
How to Calculate Average by Month in Excel
