Susan Halter won five gold medals at the Middlesex Masters Championship at Southbury Leisure Centre in Enfield.
Competing in the 80-84 year age group, Halter won the 50m freestyle, 50m backstroke and 200m freestyle to help Camden Swiss Cottage come home first in two relays.
Halter, a former Olympian, will next be in action at the British Masters Championships in Glasgow on June 20.