1) Premature old age 
Premature old age; the condition of an individual, not old in years, who displays the physical and mental characteristics of old age but not to the extent of senility. ... Origin: pre-+ L. Senilis, old ... (05 Mar 2000) ... 
Type: Term Pronunciation: prē′sĕ-nil′i-tē Definitions: 1. Premature old age; the condition of a person, not old in years, who displays the physical and mental characteristics of old age but not to the extent of senility.
premature old age.