Dotage is the weak-minded state of very great age. In his dotage.
It is unkind and old-fashioned and is used far more as an insult than a description. To be in your dotage is now said of anybody over about fifty by somebody under thirty.
1noundotageThe weak-minded state of very great age.
“He was written off as being in his dotage and outlived the writer.”
dotage is a state.
From dote, to be foolish or weak-minded, plus -age.
Middle English
dotage
English, today
dotage
Built from
From Middle English dotage, from doten (“to dote”) + -age; equivalent to dote + age.
Etymology from Wiktionary, CC BY-SA