If you activate the "Use Allowed Driver's Age" you will be setting the age restrictions for the driver.
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Complete with the minimum and maximum age permitted.
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If you select the "Use Allowed Age Without Warning" this would mean that if the driver is between these ranges of age: 17-25 or 65+90, you will be requiring them to be charged with an additional, in this case Young Driver (as you can see in the image above)
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In the contrary, if you just want the driver to have a minimum and maximum of age permitted, you can leave the "Use Allowed Age With our Warning" inactive.
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Lastly, if you activate the "Require driver license for delivery" you will be setting as mandatory for the client to have a License on the system in order to complete the delivery process.

Remember to always save changes.

In case you do not have permission to proceed with this transaction, inform your administrator so he can enable you the "Can Administrate General Setting" permission