Python: Calculate an age in year

Last update on March 31 2025 12:52:46 (UTC/GMT +8 hours)

39. Age Calculator

Write a Python program to calculate an age in years.

Sample Solution:

Python Code:

# Import the date class from datetime module
from datetime import date

# Define a function called calculate_age which calculates the age based on the date of birth
def calculate_age(dtob):
    # Get the current date
    today = date.today()
    # Calculate the age by subtracting the birth year from the current year
    # Adjust the age if the birth month and day are after today's month and day
    return today.year - dtob.year - ((today.month, today.day) < (dtob.month, dtob.day))

# Print an empty line
print()
# Print the age calculated based on the date of birth October 12, 2006
print(calculate_age(date(2006,10,12)))
# Print the age calculated based on the date of birth January 12, 1989
print(calculate_age(date(1989,1,12)))
# Print an empty line
print()

Output:

10                                                                                                            
28

Explanation:

In the exercise above,

The code imports the "date" class from the "datetime" module.
It defines a function named "calculate_age()" which calculates the age based on the provided date of birth (dtob).
Inside the "calculate_age()" function:

It gets the current date using "date.today()" function.
It calculates age by subtracting the birth year from the current year.
It adjusts the age if the birth month and day are after today's month and day.

It calculates and prints the age based on the date of birth October 12, 2006, by calling the "calculate_age()" function.
It calculates and prints the age based on the date of birth January 12, 1989, by calling the "calculate_age()" function.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to calculate a person's age in years given their birthdate and the current date.
Write a Python script that computes age from a date of birth and then determines if the person is eligible for a senior discount (age 65+).
Write a Python function to calculate age in years, months, and days given a birthdate and then format the output as a detailed string.
Write a Python program to determine age in years from a given birthdate and compare it with another age to check for equality.

Python Code Editor:

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