WASHINGTON CO., Ind. (WHAS11) — The Washington County Sheriff's Office has declared a Silver Alert as they search for an 88-year-old man.

Joseph L. Brown was last seen Thursday, December 6, in Martinsburg, Indiana. He is six-foot-tall, 190 pounds, white hair with blue eyes, carries a cane and drives a red 2015 Buick Encore with Indiana handicap plate D185XR.

Brown is believed to be in extreme danger and may require medical assistance. If you have any information on Joseph L. Brown, contact the Washington County Sheriff’s Office at 812-883-5999 or 911.