The minimum age to rent in Ireland with any company is 25 yrs old: In the case of our partner SIXT, there is a young drivers fee for driver's aged 24 years. An additional charge of 38 EUR per day. Includes 13.5% tax. Please note that if applicable, this fee will be included in the rental price and will be payable on arrival at the rental desk in the local currency. No company in Ireland will rent to someone under 24 years old.