The Montgomery County Sheriff's Office said Thomas Baker was last seen at about 4 p.m. near the Exxon at Allendale Lane and FM 1314.
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A wide-scale law enforcement search has been underway since Monday, but Baker has not been located, officials said.
Deputies said Baker has a mental/medical diagnosis that requires supervision and is known to wander and walk many miles from his location.
Authorities said he does not have a cellphone.
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Baker is described as a man with a fair complexion, 5 feet 11 inches tall, 185 pounds, with brown eyes, long gray hair, and a long beard.
He was last reportedly seen wearing blue jeans, a blue shirt, a dark-colored hoodie, and grey Velcro shoes.
Anyone with information on Baker's whereabouts is urged to contact The Montgomery County Sheriff's Office at 936-760-5800 option three and refer to case #23A097508.