A new study shows California ranked No. 42 for most car accidents with drivers aged 65 and older per 100,000 people.

Today, 42 million Americans 65 and older are licensed drivers, which represents an increase of nearly 60 percent since 1999. Total traffic fatalities also increased 22 percent for drivers 65 and older.

TheSeniorList.com released a study about which states have the worst senior drivers using data from the National Highway Transportation Safety Administration: https://www.theseniorlist.com/data/senior-driving-analysis/.

Below are the key national findings:

Older drivers accounted for 14 percent of all drivers in fatal accidents in 2017.

The 10 states with the highest number of senior drivers involved in fatal accidents: Florida, Texas, California, Georgia, North Carolina, Pennsylvania, Ohio, Tennessee, Michigan and New York.

The 10 states with the lowest number of senior drivers involved in fatal accidents: New Hampshire, South Dakota, Delaware, Hawaii, North Dakota, Wyoming, Vermont, Alaska, Rhode Island, District of Columbia.

Here are common signs that someone may need to stop driving: They have a tougher time hearing and seeing than they used to; they lose their place in conversations more frequently; and they have difficulty with motor control and experience slower reactions times.