When a person retires to get away from stress or other unpleasant situation it is not a planned career change, it is an escape.  And once the escape is successfully executed the retiree is often at a loss for something to do.  But retiring to pursue another stage in one's career is a plan.  And even if the plan doesn't work out, it still was a plan and can be replaced with another plan.  A retiree with a plan or purpose tends to be happier and more fulfilled than someone who has no plan for the future - other than to escape what he/she is doing.