Lincolnshire Police say Mark Gibbins hasn't been seen since the beginning of May by the people he lives with in Boston.
A spokesperson said: “They are becoming increasingly concerned and would like him to get in touch or return home where he is missed.
“We are asking for help in finding Mark and appeal for anyone who may know where Mark is or anyone who has seen him since the beginning of May to get in touch with us.
“We are also appealing for Mark to get in touch and make contact with us, his church or his friends.”
There are a number of ways you can contact police if you have information. Email [email protected] – using the reference Inc 75 of 6 May 20 in the subject box, by calling 101, quoting incident number Inc 75 of 6 May, or through the independent charity missing people. You can call or text 116 000 or email [email protected]