Please note that the minimum rental age requirements vary depending on the rental country. Here’s an overview:
United Kingdom: Drivers must be at least 25 years old and have two years of licensed driving experience (driver´s licence class 3 or class B)
USA, Canada, and Ireland: Drivers must be at least 21 years old and have one year of licensed driving experience (driver´s licence class 3 or class B)
Europe (not including Ireland): Drivers must be at least 18 years old and have one year of licensed driving experience (driver´s licence class 3 or class B)