Developmental researchers would classify Cooper's great-grandfather as oldest-old. That means he must be at least how old?

Name: Developmental researchers would classify Cooper's great-grandfather as oldest-old. That means he must be at least how old?
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In developmental research, the term "oldest-old" typically refers to individuals who are 85 years old or older. This classification helps researchers and practitioners to focus on the unique needs and characteristics of this age group.

Developmental Researchers Would Classify Cooper's Great-Grandfather as Oldest-Old