The rental agencies determine the rules for that. Most rental companies will not rent to anyone under the age of 25. Some will rent to people 21 to 24 years old, but charge a premium rate. The only time I have ever heard of a rental car company renting to an 18-year old is to a member of the military.
1 The lens is a soft, transparent, spherical structure that is suspended within the eye, just behind the pupil. 2  The lens is responsible for focusing light coming in through the pupil onto the retina in the back of the eye.
Light enters the eye through the transparent cornea, where much of the bending of light takes place. The white dot in the pupil is a reflection of light. THE RETINA All this intricate superstructure exists in the interests of the retina, itself an amazing structure.