For 24-year-olds seeking full coverage car insurance, the average yearly cost is $1,891 when added to a family policy. Nationwide offers the cheapest full coverage car insurance for 24-year-olds, with an annual rate of approximately $1,565.
Factors influencing these rates include driving history, location and the type of vehicle. While gender still plays a role in most states, it's less significant than during the teenage years, with driving record and location becoming more important.