Car hire (!) with 18 years abroad (Spain)

Dear car hire specialists, you will probably have to disappoint me as far as my hope of driving a car with 18 years of age abroad is concerned, but it is worth trying. The following: During summer holidays we will book a rental car. All previous research has shown that the minimum age for a rental car is 21 years (or higher). I am at the time almost 19 years old and then have more than one year of driving experience (BF17). rents, is it legal/insurance-technically legal that I drive it ? Does the minimum age refer only to the “renter”, to all “drivers” or only to a “responsible” who takes responsibility quasi in case of a damage ? I have not yet contacted the car rental companies, since I wanted to try my luck here first. Thank you for the help!