Issue #13489 Solved

[Ommodi07]

Describe your change:

• Added an algorithm for calculating age difference between two people, including input validation and doctests.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work — I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, I have opened separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in lowercase characters with no spaces or dashes.
• All function and variable names follow Python naming conventions.
• All function parameters and return values include Python type hints.
• All functions have doctests that pass automated testing.
• The algorithm includes at least one URL reference (e.g., Wikipedia) explaining the concept.
• This pull request resolves issue Python #13489 using the closing keyword: **Fixes Python #13489 **.

[cclauss]

https://github.com/TheAlgorithms/Python/blob/master/CONTRIBUTING.md