Mental health across the lifespan examines psychological well-being from early childhood to older adulthood. This field studies developmental, emotional, and cognitive changes at different life stages. Research addresses age-specific mental health challenges. Early childhood mental health is a key focus area. Adolescent emotional development and stress are examined. Adult mental health and work-life balance are explored. Aging-related mental health concerns are addressed. Preventive and early intervention strategies are emphasized. Research highlights continuity and change across life stages. Family and social influences are considered. Lifespan studies inform tailored interventions. The field supports age-appropriate mental healthcare. Policy implications are also examined. Lifelong mental well-being is promoted. This research guides holistic mental health services.