Plugin Guide - On Customer Age

This discount requirement can be used with any other discount type.

To use this discount rule, the discount requirement type should be configured as Must be assigned to customer age and the minimum and maximum age value for Required customer age as displayed in the image below.

Once saved, the discount requirement will be added to the discount as displayed in the image below.

That's all you need to do in order to use this discount requirement in your nopCommerce store.