(someone's) failing health

Translations
ухудшающееся здоровье (кого-то)
Despite his failing health, he continued to work.
Несмотря на ухудшающееся здоровье, он продолжал работать.
Definitions
A phrase used to describe a person's physical or mental condition that is gradually getting worse or deteriorating, often due to age, illness, or chronic disease.