The C9orf72 mutation carriers of both FTLD-TDP types A (Cohort 2) and B (Cohort 3), as well as the sporadic FTLD-TDP subtype C (Cohort 2) and the MAPT mutation carriers (Cohort 3), however, showed no consistent evidence in favor of age acceleration compared to controls with both DNAmClockMulti and DNAmClockCortical. The gene discussed is C9orf72; the disease is torsades de pointes.