noun
University of the Third Age (U3A)
Refers to an international educational movement for retired and semi-retired people, often called U3A. Used as a proper noun for specific institutions.
第三世代大学は、高齢者の生涯学習を支援する国際的な組織です。
The University of the Third Age is an international organization that supports lifelong learning for older adults.
Calque from English 'University of the Third Age', where 'third age' refers to the period of life after retirement.