From Longman Dictionary of Contemporary Englishdotagedo‧tage /ˈdəʊtɪdʒ $ ˈdoʊ-/ noun → in your dotage
Examples from the Corpus
dotage• It is as though they could not wait to sink into a dotage spent in permanent contemplation of their childhood.• Thurmond is as mean in his dotage as he was in his younger days.• And don't sign him into his dotage and whine about his getting old later.• For while Hare was playing out his dotage, the backroom was at work.• We all need to work at forgiveness and acceptance right into our dotage.• Is this how we want to spend our dotage?Origin dotage (1300-1400) dote “to show the mental weakness of old age” ((13-19 centuries)) 