Objective: The literature indicates that most offenders begin to desist their criminality past age 40, and therefore prevalence of antisocial personality disorder in older criminals is mitigated by an aging effect. This is a case study of a 70 year old male who has a history of severe criminality and multiple sex offenses and whose criminality would be subject to age related burnout, yet once civilly committed as a sexually dangerous person at age 68, he is showing signs of mild neurocognitive disorder with vascular risk factors. The question remains as to whether the respondent has a mental abnormality and is predisposed to commit sex offenses and has serious difficulty in controlling his behavior. Method: Respondent is a 70 year old male, with a history of polysubstance dependence, depression, traumatic brain injury, bradycardia, hypertension, antisocial personality and three sex offense convictions. He was civilly committed as a sexually dangerous person and is being evaluated for an annual review for release. Respondent has recently been very irritable and aggressive on the inpatient unit to both people and property. Restults: Despite having a prior average IQ, respondent has current impairments including NAB Memory (SS = 75) and Executive Functions (SS = 78), DKEFS number letter trails (ss = 1), and WCST O categories. Conclusion: Results are consistent with a mild neurocognitive disorder with concerns of an onset of vascular dementia and history of head injury. Concerns include whether respondent's recent aggressive/impulsive behaviors are due to antisocial personality disorder when it should be desisting or to a budding neurocognitive disorder. The case study contributes to an analysis of volitional impairment in the field of forensic neuropsychology when assessing a forensic sexually dangerous persons case.