TutorSyntax | Input and selection
Level: KS3 / GCSE

CHALLENGE
Build a program that validates an age and decides whether a person qualifies for a junior ticket.

1. Read the starter.py TODO comments and complete the program.
2. Test with typical values, boundary values and invalid input where appropriate.
3. Compare your work with solution.py only after making an attempt.
4. Extension: write at least three automated assert tests.

Runs with Python 3.10+ standard library; no external packages needed.
