Ian Thompson, from Blackburn, was last seen around Dunkirk Lane in Leyland in the early hours of Thursday (June 30).
Police say they are concerned about his welfare and are asking the public to report any sightings.
Ian is described as 5ft 6in tall with a slim build and black short thinning hair. He also now has a long dark beard.
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He was last seen wearing blue joggers, and a blue tracksuit top and was last seen carrying a small blue suitcase and two shopping bags.
Police say Ian has links to Blackburn, Leyland and Chorley.
If you have any information on Ian’s whereabouts, you can call 101, quoting log 1059 of June 29. For immediate sightings call 999.