Minimum and maximum age limits for renting a car vary by country, type of car and rental company. 

In most countries, the minimum age is 25, however, certain car categories may be available for renters between the ages of 21 and 24, with an additional young driver supplemental fee. 

Some countries may not allow rentals for below 25 years old/70 years and older - or may impose supplemental fees.

NOTE: There is no maximum age for Enterprise car rentals in Ireland.