At Avis, the young drivers surcharge is $25.00 per day for drivers aged 21-24. You will find that this is the policy amongst most of the major car hire companies.
Car insurance companies add a premium on for young drivers because the probability of the car being damaged amongst this age group is greater (which of course is a frustration to all careful young drivers out there). The same logic applies to car hire except the risk is even greater for us because we are not able to offer an incentive of no-claims bonuses nor are we able to see a customers accident history which a car insurance company is privy to. Therefore, to ensure we keep damage cost to a minimum we have a minimum age in place for young drivers.
I know that’s not completely the answer you’re looking for but I hope it provides some clarification.
Avis Rent A Car UK