The minimum age requirement to rent a car from Sixt typically varies by country and the type of rental vehicle. Generally, the minimum age is often set at twenty-one years for most locations. However, renters under the age of twenty-five may be subject to an additional young driver surcharge. This fee is placed on those less than twenty-five years old to cover the increased risk associated with younger drivers. It is important to note that in some locations, specific vehicle categories may require a minimum age of twenty-five or older. Additionally, local regulations can influence these requirements, so it is wise to verify the exact age restrictions and any surcharges that may apply to the desired rental vehicle. For the most accurate and up-to-date information, checking the current Sixt website or the specific rental office's policies is highly advisable.