Buy a separate policy for teenagers.

 

Insurance rates are based on risk so the lower risk you are considered to be, the less you are likely to pay. If you drive infrequently – for example, you take public transport to work on weekdays and only use your car on weekends – you may qualify for a low mileage discount. Inquire with your insurance company to find out if you fall in this category. Consider commuting or taking up carpooling to reduce your driving time.

Consider what the car is worth. If you have enough money in the bank to replace the car in the event of a collision, you might not need collision or comprehensive car insurance. Particularly if the car is older, you may end up paying more than the car is worth.
Unsurprisingly, good drivers are considered lower risk to insurance companies. Avoid getting any strikes against your name, such as speeding fines, in order to keep costs down.
Some insurance companies will charge you a higher premium if you also want coverage for a teenage driver. Consider taking out a separate policy for the young driver in your family, as policies specifically targeting teenagers can be cheaper. Check with your insurer to find out if this is option is available to you.