If your kids have grown up, you have more than one (actually 20) ways to save on your next auto insurance bill. Take action now so more money can flow to your retirement savings account.

1. Ask for an age discount.

Combined with a safe driving record, you can get better rates for being an older driver. "As you become a more mature driver, there are more discounts available," says Roger Sevigny, secretary and treasurer for the National Association of Insurance Commissioners and Commissioner of Insurance for the state of New Hampshire. The magic period: between "55 and 70 age range, generally," he says.

2. Tell your agent you've retired (or are doing some telecommuting.)

When you're not racking up commuter miles every day, your rates will likely go down, says Sevigny. The number of miles you're driving can have "an immediate impact" on your rates, he says.

3. Adjust your auto coverage.

If the kids have left for good, take them off the policy. If they are simply away at college, ask about a distant student credit, says Jack Hungelmann, an insurance consultant and author of "Insurance for Dummies." Usually, it applies if your child is a full-time student, has gone at least a certain distance to college and hasn't taken one of the family cars to campus. And it can give you a nice break on the premiums.