This book introduces part of the advances of the aging research conducted by Dr. Yang Wang and his collaborators since 2022. It covers several topics related to older adults, including their psychological and social well-being, their role as caregivers and care receivers, the impact of the maltreatment experience in early life, and how witnessing elder abuse could influence children. From the Contents: Productive Activities and Loneliness Among Japanese Middle Aged and Older Adults (Yang Wang).