No, it is doubtful that you turning 18 years old will decrease your car insurance rates. Though you are an adult technically you still have only a couple of years of driving experience and thus are a high risk to an insurance provider. If you are not longer in school then your may in fact lose a good student discount and at 18 your rates could rise.
Insurance rates for young drivers typically go down once you turn 25 years of age. Some insurers may lower rates at an earlier age, such as 21, however 25 is normally the age at which rates decrease since statistically that is when drivers tend to mature and become less of a risk.
In general auto insurance premiums do tend to be lowered once a driver has turned the age of 25. Statistically speaking young drivers, those under 25 years of age, are more prone to accidents due to immaturity and inexperience at driving. Risk assessors have determined that those 25 or older tend to be more responsible and thus their risk of at-fault accidents decreases.
At the age of 18 your insurance rates will typically continue to be high since you will still be classified as an inexperienced driver and are under 25 at this point in time. Marital status, age, sex and accident statistics help classify drivers. Insurance companies rating systems and factors can differ (as well as the state laws regulating them) so you would need to check with your current insurance provider to see at what age your rates will go down.
We have seen rates lowered as much as 20% once the driver on the policy reaches the age of 25 but this is if the person has a clean driving record. If the individual's driving record shows accidents and various traffic violations than the rates may not be lowered due to the bad driving record canceling out any lowered rates coming from the increase in age of the driver.
If you have finished high school and are entering college then you can still see about a good student discount. Many insurance companies recognize and reward good students with an extra discount. Usually, this discount is offered to single drivers under 25 years of age. This discount applies to Bodily Injury and Property Damage Liability, medical payments, and comprehensive and collision coverages providing that each such youthful driver meets certain requirements.
Speak to your insurance agent about what your insurance company's guidelines are regarding discounts and also about their rating system as it relates to how old you are and how many years you have of driving experience.
To shop around for rates, get an auto insurance quote right now with us. For more consumer information on how rates are set in Florida you can contact the FL insurance regulator which is the state agency that car insurance companies must file their rates with.