Fixes #13609 - disallow sorting on age

[snipe]

This disallows the sort arrows on the age column, since it's a displayed calculated value, not one that lives in the database.

[what-the-diff]

PR Summary

• Modification in Asset Display Properties
  In the code, there has been an alteration to how certain aspects of assets in our system are presented. Previously, it was possible to search and sort assets based on their 'age'. However, following this change, the 'age' parameter can't be used to search or organize the assets.