Cox moved to Meadows Place, Texas after her 103rd birthday and lives there in an assisted living facility. For her 105th birthday the mayor named February 22 as Lillian Cox Day. On February 22, 2017 Cox became a supercentenarian, when she reached the age of 110 years. Cox died in Meadows Place, Texas on August 10, 2018, aged 111 years, 169 days.