Create UI - min start date check is not working (was: Re-enact previous error message)

Environment - Prod
User class - End User
- [ ] When trying to complete a firm registration (as a regular user) and I enter a Start Date older than 10 years, I receive this generic error:

To Do List:
- [ ] Replace generic error message with a clear error.
- [ ] UI/UX to retrieve previous error message from repository and provide here.
- [ ] Error message should read something like this:
- " Start Date cannot be older than 10 years from today's date. Please adjust this date and try again."

Start by reproducing the validation failure in the Create UI with a Start Date more than 10 years old, then trace where that field's validation and generic error are handled. Done means the UI rejects the date and displays the specified clear message; no file or test is named in the issue, so locate the relevant frontend entry point and existing validation coverage first.

Written by the indexing model from the issue text.