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1. Print "Hello, World!"2. Add Two Numbers3. Swap Two Variables4. Find ASCII Value of a Character5. Check Even or Odd6. Find Largest of Two Numbers7. Find Largest of Three Numbers8. Check Positive, Negative, or Zero9. Convert Kilometers to Miles10. Convert Celsius to Fahrenheit11. Calculate Area of a Triangle12. Calculate Simple Interest13. Calculate Compound Interest14. Calculate Square Root15. Convert Seconds to Hours, Minutes, and Seconds16. Calculate Body Mass Index (BMI)17. Check Leap Year18. Find Absolute Value19. Calculate Age from Birth Year20. Sum of First N Natural Numbers21. Calculate Power Without Using pow()22. Print Multiplication Table23. Convert Decimal to Binary24. Convert Binary to Decimal25. Calculate Electricity Bill

Calculate Age from Birth Year in Python

this year minus birth year. Wrong if your birthday hasn't happened yet. Close enough for a first program.

BeginnerBasic Python ProgramsExample 19 of 25
calculate-age-from-birth-year.py
1# Program to calculate age from birth year
2

3from datetime import date
4

5birth_year = int(input("Enter your birth year: "))
6current_year = date.today().year
7

8if birth_year > current_year:
9    print("Birth year cannot be in the future.")
10else:
11    age = current_year - birth_year
12    print("Your age is:", age)

Output

Enter your birth year: 2000
Your age is: 25

In this one

  • date.today().year, not a hardcoded 2026
  • this ignores the actual birthday

What's going on

date.today().year - birth_year. In September 2026, born 2000 → 26. If your birthday is in December you are still 25. This program does not care. Say that out loud if you use it for anything real.

from datetime import date so the year is not a hardcoded 2026 that rots.

Future birth years get a message instead of a negative age.

After this program

If the idea is still fuzzy, read Day 1: Introduction to Python in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 25 basic python programs, or see every topic on Python exercises.

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