There are different minimum ages for rental cars. Depending on the destination and rental company, a young driver surcharge may be levied.
If you have entered your age correctly when searchingon billiger-mietwagen.de, you will only see offers that are suitable for your age. Any surcharges are already included in the total price shown.
Please note that there are driving licence validity requirements in addition to age. In most cases, you must have held your driving licence for at least one year. You will find information on this in the rental conditions of the offers.