According to the California DMV, in 2007, the median age of a person arrested for DUI / Drunk Driving was 30 years old. A little more than half (52.7%) of the arrests were 30 years old or younger. Almost three-quarters (74.6%) were 40 years old or younger. Less than 1% of all DUI / Drunk Driving arrests were juveniles (under 18). Only 2.2% of people arrested for DUI / Drunk Driving we over 60 years old. Over a 10 year period from 1997 - 2007, there was a 26% increase in DUI / Drunk Driving arrests for people under 21 years old. In 2007, 9.2% of arrests were under 21 compared to 7.3% in 1997. While males accounted for 81.2% of those arrested in 2007, females went from 10.6% in 1997 to 18.8% of people arrested for DUI / Drunk Driving in 2007.