dot·age 
/ˈdoʊtɪʤ/ noun
/ˈdoʊtɪʤ/ noun [noncount] : the period of old age : the time when a person is old and often less able to remember or do things — often used after in or into ▪ He has become friendlier in his dotage. ▪ The actress continued to work well into her dotage.
