Geriatrics refers to medical care for older adults. Age 65 is often used as Medicare eligibility threshold. US population over 65 increased from 5% in 1920 to 17% in 2020. Women live about 4-5 years longer than men
Opossum is a South American marsupial, born after 15-day gestation. Nocturnal, solitary species that breeds year-round. Born with reptile-like traits and can regenerate spinal cords