In England, women at age 65 can expect to live for an additional 21.2 years. This means that you could expect to reach your 86th birthday.
For details on life expectancy please see the Office for National Statistics website: www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/lifeexpectancies/bulletins/lifeexpectancyatbirthandatage65bylocalareasinenglandandwales/2015-11-04#national-life-expectancy-at-age-65