Can the elderly be on antipsychotics (risperidone) for years at low doses (1mg) to control behavior?

Yes that can be a : Way to approach this problem. However be aware that atypical antipsychotics now have a fda black box warning: "warning: increased mortality in elderly patients with dementia related psychosis** elderly patients with dementia-related psychosis treated with antipsychotic drugs are at an increased risk of death. Risperidone (risperidone) is not approved for the treatment of patients with dementia >.

Anti Psychotic meds: It is possible but needs to be managed very carefully as elderly patients metabolize medications differently.