Illderly is an antonym of wellderly.
As nouns the difference between illderly and wellderly
is that illderly is old people who are in poor health while wellderly is old people who are in good health.
illderly
English
Noun
(-)
Old people who are in poor health
Antonyms
* wellderly wellderly
English
Noun
(-)
Old people who are in good health
Antonyms
* illderly