Add Input Validation for Age in Astronomical Age Calculator

[SaiTejaswaniBikkasani]

Hey @Sulagna-Dutta-Roy

Describe the bug
The Astronomical Age Calculator allows users to input negative ages, as shown in the attached screenshot. This happens because the input field for age does not have a minimum value constraint, leading to invalid age calculations.

To Reproduce
Steps to reproduce the behavior:

• Open the Astronomical Age Calculator application.
• Enter a negative value (e.g., -9) in the age input field.
• Click on the "Calculate" button.
• Observe the error message prompting for a valid age

Expected behavior
The application should prevent users from entering negative values for age. The input field should accept only positive values (including zero if applicable)

Screenshots

Please add the gssoc labels and I would like to work on it under GSSOC'24. Thank you!!

[github-actions]

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[github-actions]

Hello @SaiTejaswaniBikkasani! Your issue #1612 has been closed. Thank you for your contribution!