The accident happened around 4:00 p.m. Saturday afternoon near the intersection of South Rockport and Metz Roads, south of Boonville.
Warrick County Sheriff Brett Kruse says a 20-year-old Tyler Hylton from Reynolds, Kentucky crossed the center line and hit a van driven by Norma Jean Love.
Love is 86-years-old and lives in Boonville. Sheriff Kruse says Love is a retired Evansville Police Officer.
She was taken to St. Mary's Hospital with serious injuries.
The sheriff says the man who hit Love refused treatment at the scene, but was later taken to the hospital by his parents.
Sheriff Kruse says drugs and alcohol are not suspected to be involved in the accident.