My dad is a little bit like that.He retired last year. Spent maybe half a year at home and then got himself a job again. He has no hobbies, can't sit at home for more than an hour and etc.For him, the job is the goal. He talks about it, he happily complains and yet he does want to go there. His decision to go back to work was influenced by the financial gains,as my parents do need that income, however I very much doubt it'd be very different outcome if money wasn't part of thr equation.