I am looking to rent a car from and to Dublin airport. From the 30th of November to the 3rd of December. The main driver is 23yo and has 3+ years of experience driving
This is not possible, but look here to be sure:-
The driver must have held a full driving licence for at least one year. At STEP2, click on the link "IMPORTANT INFORMATION' displayed to the right of the car photo of your choice. This will open another smaller window and if you click on "DRIVER" you will see what age restrictions there may be and any associated fees. Try a few different car models / suppliers, as they do differ.